Revert "Add support for the AI-only F-14A."

AI behavior with the Heatblur F-14 has been fixed, so not needed any
more.

Fixes https://github.com/dcs-liberation/dcs_liberation/issues/1927.

This reverts commit 7387c2ed8f.

game/ato/ai_flight_planner_db.py

@@ -44,7 +44,6 @@ from dcs.planes import (
     FW_190A8,
     FW_190D9,
     F_117A,
-    F_14A,
     F_14A_135_GR,
     F_14B,
     F_15C,
@@ -145,7 +144,6 @@ CAP_CAPABLE = [
     F_15D,
     F_14B,
     F_14A_135_GR,
-    F_14A,
     Su_33,
     J_11A,
     Su_30,