Replace QLatin1String, QStringLiteral ("") with QString()

Change-Id: I21e6165e7e8858df8436c04c9afcc1be5242bda4
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: André Hartmann <aha_1980@gmx.de>

src/plugins/diffeditor/differ.cpp

@@ -1275,7 +1275,7 @@ QStringList Differ::encode(const QString &text1,
                                   QString *encodedText2)
 {
     QStringList lines;
-    lines.append(QLatin1String("")); // don't use code: 0
+    lines.append(QString()); // don't use code: 0
     QMap<QString, int> lineToCode;
 
     *encodedText1 = encode(text1, &lines, &lineToCode);