Make temporary fix for stale xkb_atoms

When xkb_free_keymap is called the atoms are all free'd, but action.c
keeps a global copy of interned "true" and "false", which remains stale.

The correct fix is to remove the need for the ActionsInit function
entirely.

Signed-off-by: Ran Benita <ran234@gmail.com>

src/xkbcomp/action.c

@@ -1183,11 +1183,13 @@ HandleActionDef(ExprDef * def,
             if ((arg->op == OpNot) || (arg->op == OpInvert))
             {
                 field = arg->value.child;
+                constFalse.value.str = xkb_intern_atom("false");
                 value = &constFalse;
             }
             else
             {
                 field = arg;
+                constTrue.value.str = xkb_intern_atom("true");
                 value = &constTrue;
             }
         }