DiffEditor: avoid gcc warning

overflow in implicit constant conversion

Change-Id: I8eaf55ab1e2108de44e7aa2dc832e1ee13814d3b
Reviewed-by: Jarek Kobus <jaroslaw.kobus@theqtcompany.com>

src/plugins/diffeditor/differ.cpp

@@ -983,7 +983,7 @@ QString Diff::toString() const
 {
     QString prettyText = text;
     // Replace linebreaks with pretty char
-    prettyText.replace(QLatin1Char('\n'), QLatin1Char(L'\u00b6'));
+    prettyText.replace(QLatin1Char('\n'), QLatin1Char('\xb6'));
     return commandString(command) + QLatin1String(" \"")
             + prettyText + QLatin1String("\"");
 }