qt: UUID updates

* Ensure relative paths are properly resolved
* Do not display a mismatch prompt unless the system has configured NICs

src/qt/qt_util.hpp

@@ -17,6 +17,7 @@ QString currentUuid();
 void storeCurrentUuid();
 bool compareUuid();
 void generateNewMacAdresses();
+bool hasConfiguredNICs();
 };
 
 #endif