In case the specified backend executable is not an executable, show the path...

In case the specified backend executable is not an executable, show the path of the file in the warning and not the name of the backend.

src/lib/backend.cpp

@@ -198,7 +198,7 @@ bool Backend::checkExecutable(const QString& name, const QString& path, QString*
         if (reason)
             *reason = i18n("The specified file '%1' doesn't point to an executable. "
                         "Please provide the correct path in the application settings and try again.",
-                        name);
+                        path);
         return false;
     }