switch texture to non compressed internal texture on camera grain material

Assets/Scenes/CameraGrain/CameraGrain.mat

         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
     - _MainTex:
-        m_Texture: {fileID: 10309, guid: 0000000000000000f000000000000000, type: 0}
+        m_Texture: {fileID: 10305, guid: 0000000000000000f000000000000000, type: 0}
         m_Scale: {x: 1, y: 1}
         m_Offset: {x: 0, y: 0}
     - _MetallicGlossMap:
     - _Color: {r: 0.59527415, g: 0.6643424, b: 0.8584906, a: 1}
     - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
     - _NoiseSpeed: {r: 30, g: 20, b: 0, a: 0}
-  m_BuildTextureStacks: []