Hopefully fix decals when used with certain parts

Assets/Shaders/DecalFeatureBumped.shader

@@ -59,7 +59,7 @@ Shader "ConformalDecals/Feature/Bumped"
             void surf (DecalSurfaceInput IN, inout SurfaceOutput o)
             {
                 float4 color = tex2D(_Decal, IN.uv_decal);
-                float3 normal = UnpackNormal(tex2D(_DecalBumpMap, IN.uv_bump));
+                float3 normal = UnpackNormalDXT5nm(tex2D(_DecalBumpMap, IN.uv_bump));
  
                 #ifdef DECAL_PROJECT
                     // clip alpha

Assets/Shaders/DecalsCommon.cginc

@@ -218,7 +218,7 @@ fixed4 frag_forward(v2f IN) : SV_Target
         #ifdef DECAL_PREVIEW
            i.normal = fixed3(0,0,1);
         #else
-           i.normal = UnpackNormal(tex2D(_BumpMap, IN.uv_base));
+           i.normal = UnpackNormalDXT5nm(tex2D(_BumpMap, IN.uv_base));
         #endif //DECAL_PREVIEW
     #endif //DECAL_BASE_NORMAL