TextEditor: Use Qt5-style connects

The heavy lifting was done by clazy.

Change-Id: I380120e3419d2a3c0e272f51cc3e0d5f6aaa5e9b
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/texteditor/snippets/snippetscollection.h

@@ -97,10 +97,9 @@ public:
     void reload();
     bool synchronize(QString *errorString);
 
-private slots:
+private:
     void identifyGroups();
 
-private:
     SnippetsCollection();
 
     int groupIndex(const QString &groupId) const;