Fix infinitely scaled decals with zero scale and depth

Source/ConformalDecals/ModuleConformalDecal.cs

@@ -425,6 +425,8 @@ namespace ConformalDecals {
         }
 
         protected void UpdateScale() {
+            scale = Mathf.Max(0.01f, scale);
+            depth = Mathf.Max(0.01f, depth);
             var aspectRatio = materialProperties.AspectRatio;
             Vector2 size;