i18n: drop superfluous QObject* parent

These additional pointers were introduced for translations,
and needed their own tricks to get lupdate to recognize the
strings. Using QCoreApplication::translate() removes the
need to a QObject to provide context. Drop the now-unneeded
parameters.

src/modules/shellprocess/ShellProcessJob.cpp

@@ -62,7 +62,7 @@ ShellProcessJob::exec()
         return Calamares::JobResult::ok();
     }
 
-    return m_commands->run( this );
+    return m_commands->run();
 }