Add missing readonly for colors

com.unity.render-pipelines.high-definition/HDRP/Editor/Lighting/Reflection/HDReflectionProbeEditor.Handles.cs

         internal static Color k_GizmoThemeColorDisabled = new Color(0x99 / 255f, 0x89 / 255f, 0x59 / 255f, 0x10 / 255f);
         internal static Color k_GizmoThemeColorDisabledFace = new Color(0x99 / 255f, 0x89 / 255f, 0x59 / 255f, 0x10 / 255f);
 
-        internal static Color[][] k_handlesColor = new Color[][]
+        internal static readonly Color[][] k_handlesColor = new Color[][]
         {
             new Color[]
             {

com.unity.render-pipelines.high-definition/HDRP/Editor/Lighting/Reflection/Volume/InfluenceVolumeUI.cs

     partial class InfluenceVolumeUI : BaseUI<SerializedInfluenceVolume>
     {
         const int k_AnimBoolFields = 2;
-        internal static Color k_GizmoThemeColorBase = new Color(255f / 255f, 229f / 255f, 148f / 255f, 80f / 255f);
-        internal static Color k_GizmoThemeColorBaseFace = new Color(255f / 255f, 229f / 255f, 148f / 255f, 45f / 255f);
-        internal static Color k_GizmoThemeColorInfluence = new Color(83f / 255f, 255f / 255f, 95f / 255f, 75f / 255f);
-        internal static Color k_GizmoThemeColorInfluenceFace = new Color(83f / 255f, 255f / 255f, 95f / 255f, 17f / 255f);
-        internal static Color k_GizmoThemeColorInfluenceNormal = new Color(0f / 255f, 229f / 255f, 255f / 255f, 80f / 255f);
-        internal static Color k_GizmoThemeColorInfluenceNormalFace = new Color(0f / 255f, 229f / 255f, 255f / 255f, 36f / 255f);
-        internal static Color k_GizmoThemeColorProjection = new Color(0x00 / 255f, 0xE5 / 255f, 0xFF / 255f, 0x20 / 255f);
-        internal static Color k_GizmoThemeColorProjectionFace = new Color(0x00 / 255f, 0xE5 / 255f, 0xFF / 255f, 0x20 / 255f);
-        internal static Color k_GizmoThemeColorDisabled = new Color(0x99 / 255f, 0x89 / 255f, 0x59 / 255f, 0x10 / 255f);
-        internal static Color k_GizmoThemeColorDisabledFace = new Color(0x99 / 255f, 0x89 / 255f, 0x59 / 255f, 0x10 / 255f);
+        internal static readonly Color k_GizmoThemeColorBase = new Color(255f / 255f, 229f / 255f, 148f / 255f, 80f / 255f);
+        internal static readonly Color k_GizmoThemeColorBaseFace = new Color(255f / 255f, 229f / 255f, 148f / 255f, 45f / 255f);
+        internal static readonly Color k_GizmoThemeColorInfluence = new Color(83f / 255f, 255f / 255f, 95f / 255f, 75f / 255f);
+        internal static readonly Color k_GizmoThemeColorInfluenceFace = new Color(83f / 255f, 255f / 255f, 95f / 255f, 17f / 255f);
+        internal static readonly Color k_GizmoThemeColorInfluenceNormal = new Color(0f / 255f, 229f / 255f, 255f / 255f, 80f / 255f);
+        internal static readonly Color k_GizmoThemeColorInfluenceNormalFace = new Color(0f / 255f, 229f / 255f, 255f / 255f, 36f / 255f);
+        internal static readonly Color k_GizmoThemeColorProjection = new Color(0x00 / 255f, 0xE5 / 255f, 0xFF / 255f, 0x20 / 255f);
+        internal static readonly Color k_GizmoThemeColorProjectionFace = new Color(0x00 / 255f, 0xE5 / 255f, 0xFF / 255f, 0x20 / 255f);
+        internal static readonly Color k_GizmoThemeColorDisabled = new Color(0x99 / 255f, 0x89 / 255f, 0x59 / 255f, 0x10 / 255f);
+        internal static readonly Color k_GizmoThemeColorDisabledFace = new Color(0x99 / 255f, 0x89 / 255f, 0x59 / 255f, 0x10 / 255f);
 
         static readonly int k_ShapeCount = Enum.GetValues(typeof(ShapeType)).Length;