Modify OptimizeProjectionMatrix() to work with oblique projections

ScriptableRenderPipeline/HDRenderPipeline/ShaderVariables.hlsl

     // Orthographic Perspective  Combined(OR)
     // | x 0 0 x |  | x 0 x 0 |  | x 0 x x |
     // | 0 x 0 x |  | 0 x x 0 |  | 0 x x x |
-    // | 0 0 x x |  | 0 0 x x |  | 0 0 x x |
+    // | x x x x |  | x x x x |  | x x x x | <- oblique projection row
-    M._21_31_41 = 0;
-    M._12_32_42 = 0;
+    M._21_41 = 0;
+    M._12_42 = 0;
     return M;
 }