Utils: Replace FileChooser::path() by filePath().toString()

Keep the old method for now to ease downstream porting.

The change is kept mechanical, there's a lot of cleanup possible now
on the user code side.

Change-Id: I936baedd45b7ba057f1c789a1bec896886f48eff
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/debugger/debuggeritemmanager.cpp

@@ -427,7 +427,7 @@ void DebuggerItemConfigWidget::binaryPathHasChanged()
         return;
 
     DebuggerItem tmp;
-    QFileInfo fi = QFileInfo(m_binaryChooser->path());
+    QFileInfo fi = QFileInfo(m_binaryChooser->filePath().toString());
     if (fi.isExecutable()) {
         tmp = item();
         tmp.reinitializeFromFile();