Utils: Rename PathChooser::{f,setF}ileName() to {f,setF}ilePath()

It's returning a FilePath, so it's a better fit.

Keep the old versions as inline function now to ease downstream migration.

Change-Id: I535887928018f42b92895c8b0c82527f0d55e5ca
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: André Hartmann <aha_1980@gmx.de>

src/plugins/debugger/unstartedappwatcherdialog.cpp

@@ -121,7 +121,7 @@ UnstartedAppWatcherDialog::UnstartedAppWatcherDialog(QWidget *parent)
             if (isLocal(runConfig)) {
                 resetExecutable->setEnabled(true);
                 connect(resetExecutable, &QPushButton::clicked, this, [this, runnable] {
-                    m_pathChooser->setFileName(runnable.executable);
+                    m_pathChooser->setFilePath(runnable.executable);
                 });
             }
         }