CMakePM: Allow copy / editing of build directory

This reverts 69b0a2cafc

The build directory is preset and by having the ability to edit, you can
easily do a new build by appending a number.

When you have a new build directory a dialog will warn you that you'll
start from scratch. This is enough of a hinderniss to the user to start
typing and get lots of build directories. No need to have it read only.

Fixes: QTCREATORBUG-24451
Change-Id: Id1bc77d0fbcb071608f5ac83ddd6b8af943fdac5
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/pathchooser.h

@@ -138,9 +138,6 @@ public:
     bool isReadOnly() const;
     void setReadOnly(bool b);
 
-    bool isFileDialogOnly() const;
-    void setFileDialogOnly(bool b);
-
     void triggerChanged();
 
     // global handler for adding context menus to ALL pathchooser
@@ -164,7 +161,6 @@ private:
     QString makeDialogTitle(const QString &title);
     void slotBrowse();
     void contextMenuRequested(const QPoint &pos);
-    void updateReadOnlyStateOfSubwidgets();
 
 signals:
     void validChanged(bool validState);