Rewrote assertions

src/dawn/display/Color.cpp

@@ -78,6 +78,6 @@ struct Color Color::fromString(std::string str) {
   }
 
   // TODO: Parse other kinds of colors
-  assertUnreachable("Failed to find a color match for " + str);
+  assertUnreachable("Failed to find a color match for %s", str);
   return {};
 }