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/qnx/qnxdebugsupport.cpp

@@ -178,7 +178,7 @@ public:
     }
 
     QString projectSource() const { return m_projectSource->path(); }
-    FilePath localExecutable() const { return m_localExecutable->fileName(); }
+    FilePath localExecutable() const { return m_localExecutable->filePath(); }
 
 private:
     PathChooser *m_projectSource;