DlgPrefRecord: enable CUE sheet recording by default

A CUE sheet cannot be created retroactively after making a
recording, so it is better to have it on by default. If a user
does not want them, they can delete the CUE files and turn off
the option easily.

As discussed on Zulip
https://mixxx.zulipchat.com/#narrow/stream/109122-general/topic/Exporting.20a.20Mixcloud-digestable.20playlist

src/preferences/dialog/dlgprefrecord.cpp

@@ -70,7 +70,7 @@ DlgPrefRecord::DlgPrefRecord(QWidget* parent, UserSettingsPointer pConfig)
 
     // Setting miscellaneous
     CheckBoxRecordCueFile->setChecked(
-            (bool) m_pConfig->getValueString(ConfigKey(RECORDING_PREF_KEY, "CueEnabled")).toInt());
+            m_pConfig->getValue<bool>(ConfigKey(RECORDING_PREF_KEY, "CueEnabled"), true));
 
     // Setting split
     comboBoxSplitting->addItem(SPLIT_650MB);
@@ -174,7 +174,7 @@ void DlgPrefRecord::slotUpdate()
 
      // Setting miscellaneous
     CheckBoxRecordCueFile->setChecked(
-            (bool) m_pConfig->getValueString(ConfigKey(RECORDING_PREF_KEY, "CueEnabled")).toInt());
+            m_pConfig->getValue<bool>(ConfigKey(RECORDING_PREF_KEY, "CueEnabled"), true));
 
     QString fileSizeStr = m_pConfig->getValueString(ConfigKey(RECORDING_PREF_KEY, "FileSize"));
     int index = comboBoxSplitting->findText(fileSizeStr);