Don't show ground unit menu at carriers.

Fixes https://github.com/dcs-liberation/dcs_liberation/issues/1220

changelog.md

@@ -20,6 +20,7 @@ Saves from 3.x are not compatible with 4.0.
 * **[UI]** Made non-interactive map elements less obstructive.
 * **[UI]** Added support for Neutral Dot difficulty label
 * **[UI]** Clear skies at night no longer described as "Sunny" by the weather widget.
+* **[UI]** Removed ability to buy (useless) ground units at carriers and LHAs.
 
 # 3.0.0
 

qt_ui/windows/basemenu/QBaseMenuTabs.py

@@ -29,6 +29,6 @@ class QBaseMenuTabs(QTabWidget):
         else:
             self.airfield_command = QAirfieldCommand(cp, game_model)
             self.addTab(self.airfield_command, "Airfield Command")
-            if not isinstance(cp, OffMapSpawn):
+            if cp.can_deploy_ground_units:
                 self.ground_forces_hq = QGroundForcesHQ(cp, game_model)
                 self.addTab(self.ground_forces_hq, "Ground Forces HQ")