BLI: Math: Fix perspective matrix function

The port missed this one component that should have been left to 0.0.

source/blender/blenlib/BLI_math_matrix.hh

@@ -1136,6 +1136,7 @@ MatBase<T, 4, 4> perspective(T left, T right, T bottom, T top, T near_clip, T fa
     mat[2][2] = -(far_clip + near_clip) / z_delta;
     mat[2][3] = -1.0f;
     mat[3][2] = (-2.0f * near_clip * far_clip) / z_delta;
+    mat[3][3] = 0.0f;
   }
   return mat;
 }

source/blender/gpu/shaders/common/gpu_shader_math_matrix_lib.glsl

@@ -1343,6 +1343,7 @@ mat4x4 projection_perspective(
     mat[2][2] = -(far_clip + near_clip) / z_delta;
     mat[2][3] = -1.0;
     mat[3][2] = (-2.0 * near_clip * far_clip) / z_delta;
+    mat[3][3] = 0.0;
   }
   return mat;
 }