Unmaximize terminal before moving to new tab

This ensures that all the other terminals (in other splits)
will still be visible after moving the maximized terminal
to a new tab.

(cherry picked from commit 9d4df205)

src/widgets/ViewContainer.cpp

@@ -708,5 +708,7 @@ void TabbedViewContainer::setNavigationBehavior(int behavior)
 }
 
 void TabbedViewContainer::moveToNewTab(TerminalDisplay* display) {
+    // Ensure that the current terminal is not maximized so that the other views will be shown properly
+    activeViewSplitter()->handleMinimizeMaximize(false);
     addView(display);
 }