increase precision to full floats for _CameraDepthTexture

Assets/ScriptableRenderLoop/fptl/Internal-DeferredComputeShading.compute

 #include "TiledLightingTemplate.hlsl"
 #include "TiledReflectionTemplate.hlsl"
 
-Texture2D _CameraDepthTexture;
+Texture2D_float _CameraDepthTexture;
 Texture2D _CameraGBufferTexture0;
 Texture2D _CameraGBufferTexture1;
 Texture2D _CameraGBufferTexture2;

Assets/ScriptableRenderLoop/fptl/Internal-DeferredReflections.shader

 #include "TiledReflectionTemplate.hlsl"
 
 
-Texture2D _CameraDepthTexture;
+Texture2D_float _CameraDepthTexture;
 Texture2D _CameraGBufferTexture0;
 Texture2D _CameraGBufferTexture1;
 Texture2D _CameraGBufferTexture2;

Assets/ScriptableRenderLoop/fptl/Internal-DeferredShading.shader

 #include "TiledLightingTemplate.hlsl"
 
 
-Texture2D _CameraDepthTexture;
+Texture2D_float _CameraDepthTexture;
 Texture2D _CameraGBufferTexture0;
 Texture2D _CameraGBufferTexture1;
 Texture2D _CameraGBufferTexture2;