Write timezone correctly.

src/modules/locale/SetTimezoneJob.cpp

@@ -88,16 +88,17 @@ SetTimezoneJob::exec()
                                                 .arg( zoneinfoPath )
                                                 .arg( "/etc/localtime" ) );
 
-    QFile timezoneFile( "/etc/timezone" );
-    if ( timezoneFile.exists() )
-    {
-      if (!timezoneFile.open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Truncate))
-          return Calamares::JobResult::error( tr( "Cannot set timezone,"),
-                                              tr( "Cannot open /etc/timezone for writing"));
+    QFile timezoneFile( gs->value( "rootMountPoint" ).toString() + "/etc/timezone" );
+
+    if ( !timezoneFile.open( QIODevice::WriteOnly |
+                             QIODevice::Text |
+                             QIODevice::Truncate ) )
+        return Calamares::JobResult::error( tr( "Cannot set timezone,"),
+                                            tr( "Cannot open /etc/timezone for writing"));
+
+    QTextStream out(&timezoneFile);
+    out << m_region << '/' << m_zone << "\n";
+    timezoneFile.close();
 
-        QTextStream out(&timezoneFile);
-        out << m_region << '/' << m_zone << "\n";
-        timezoneFile.close();
-    }
     return Calamares::JobResult::ok();
 }