syncqt: remove dead code

Either the code in the try {} block

- doesn't throw, then the return within the try {} block exits the
  function, or it
- throws fileystem_error, then we rethrow in the catch, or it
- throws any other exception, then we leave the function by exception

In no case can control reach the trailing 'return {}'.

Found by Coverity.

Amends 7aecb189d544613ad13c7e7d1207bd7767225a71.

Pick-to: 6.7 6.6 6.5
Coverity-Id: 444466
Change-Id: I1c1bf752453076724c2fa9367ea5309e741d84ac
Reviewed-by:  Alexey Edelev <alexey.edelev@qt.io>

src/tools/syncqt/main.cpp

@@ -151,7 +151,6 @@ std::filesystem::path normilizedPath(const std::string &path)
         printFilesystemError(fserr, "Unable to normalize path");
         throw;
     }
-    return {};
 }
 
 bool createDirectories(const std::string &path, std::string_view errorMsg, bool *exists = nullptr)