Git: De-noise

* Remove QLatin1{String|Char} where possible
* Use initializer lists for QStringList

Change-Id: I8479f87f4fc909b5d74d854956885564209538e4
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/git/gitclient.h

@@ -121,8 +121,6 @@ public:
         PushAction m_pushAction = NoPush;
     };
 
-    static const char *stashNamePrefix;
-
     explicit GitClient();
 
     Utils::FileName vcsBinary() const override;