Core: Add setting to hide the TaskWatcher (#22857)

* Core: Add setting to hide the TaskWatcher

* Move setting to Display/UI

* Clarify option description

Co-authored-by: Max Wilfinger <6246609+maxwxyz@users.noreply.github.com>

* Use sentence case for section title

Co-authored-by: Max Wilfinger <6246609+maxwxyz@users.noreply.github.com>

---------

Co-authored-by: Max Wilfinger <6246609+maxwxyz@users.noreply.github.com>

src/Gui/PreferencePages/DlgSettingsUI.cpp

@@ -86,6 +86,9 @@ void DlgSettingsUI::saveSettings()
     ui->overlayAutoHideCheckBox->onSave();
     ui->mouseClickPassThroughCheckBox->onSave();
     ui->mouseWheelPassThroughCheckBox->onSave();
+
+    // TaskWatcher
+    ui->showTaskWatcherCheckBox->onSave();
 }
 
 void DlgSettingsUI::loadSettings()
@@ -113,6 +116,9 @@ void DlgSettingsUI::loadSettings()
     ui->mouseClickPassThroughCheckBox->onRestore();
     ui->mouseWheelPassThroughCheckBox->onRestore();
 
+    // TaskWatcher
+    ui->showTaskWatcherCheckBox->onRestore();
+
     loadStyleSheet();
 }