Debugger: Remove old formatting hacks

These go back to the time where we faced raw GDB output. Nowadays
we get polished data from the dumpers already.

Change-Id: Ifeb2c0609d482bbd6d7783242f13c74ecc320233
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/watchdata.h

@@ -69,7 +69,6 @@ public:
 
     void setError(const QString &);
     void setValue(const QString &);
-    void setType(const QString &, bool guessChildrenFromType = true);
 
     QString toString() const;