Removed colon again from the electric characters

It broke indentation for global scope operator, and when that was fixed
it broke for the class initializer lists. I'm not sure how to fix that
at the moment, so better have it not do anything rather than being in
the way.

src/plugins/cppeditor/cppeditor.cpp

@@ -843,8 +843,7 @@ bool CPPEditor::isElectricCharacter(const QChar &ch) const
 {
     if (ch == QLatin1Char('{') ||
         ch == QLatin1Char('}') ||
-        ch == QLatin1Char('#') ||
-        ch == QLatin1Char(':')) {
+        ch == QLatin1Char('#')) {
         return true;
     }
     return false;