Engraving UTests: more intuitive diffs for failing tests

The ref file should be passed as the first argument, and the current output as the second argument, otherwise the '-' and '+' in front of lines are inverted w.r.t. what you would intuitively expect.

(Of course you have those '---' and '+++' lines at the beginning, so you can still easily figure out what's going on, but it's nice if you can use your intuition too.)

src/engraving/utests/utils/scorecomp.cpp

@@ -35,15 +35,17 @@ bool ScoreComp::saveCompareScore(Score* score, const String& saveName, const Str
     if (!ScoreRW::saveScore(score, saveName)) {
         return false;
     }
-    return compareFiles(saveName, ScoreRW::rootPath() + u"/" + compareWithLocalPath);
+
+    return compareFiles(ScoreRW::rootPath() + u"/" + compareWithLocalPath, saveName);
 }
 
 bool ScoreComp::saveCompareMimeData(ByteArray mimeData, const String& saveName, const String& compareWithLocalPath)
 {
     if (!ScoreRW::saveMimeData(mimeData, saveName)) {
         return false;
     }
-    return compareFiles(saveName, ScoreRW::rootPath() + u"/" + compareWithLocalPath);
+
+    return compareFiles(ScoreRW::rootPath() + u"/" + compareWithLocalPath, saveName);
 }
 
 bool ScoreComp::compareFiles(const String& fullPath1, const String& fullPath2)