Properly check disabled state of training squad

The value of the training_squad state was being ignored, despite being used by
the ui to distinguish between being enabled, or being disabled.
This caused later disabled squads to remain in the pool of training
squads.

Author: NicksWorld

autotraining.lua

@@ -139,9 +139,9 @@ end
 
 function getTrainingSquads()
     local squads = {}
-    for squad_id, _ in pairs(state.training_squads) do
+    for squad_id, active in pairs(state.training_squads) do
         local squad = df.squad.find(squad_id)
-        if squad then
+        if active and squad then
             table.insert(squads, squad)
         else
             -- setting to nil during iteration is permitted by lua

changelog.txt

@@ -33,6 +33,7 @@ Template for new versions:
 ## New Features
 
 ## Fixes
+- `autotraining`: squads once used for training then disabled now properly are treated as disabled.
 
 ## Misc Improvements