lol buddy, imma make this entirely fool proof for you
step by step
on how to get rid of it okay? just gimme a sec to test something

1. Start Editor
2. Go to Object Editor (f6)
3. Make sure your under the unit Tab
4. Scroll down the list and Find Peasant - Look for a little part Called
Abilities - Normal Harvest(gold and lumber), Call to Arms(peasant), Repair
5. Once that part is found, remove call to arms - Faze One Complete
Next faze, is to get rid of ability on buildings right?
1.Go To Object Editor
2. Go to the Abilities Tab ( Not Units Tab )
3. Not far down the list there should be 2 abilities called "call to arms"
One For Town Hall, One For Peasants
4. Select The One for Town Hall
5. Scroll down the list till you find
Art- Icon Normal Call To Arms.. Etc..
Art- Icon Turnoff Call to Arms turnoff etc..
6. double click on both of these and scroll up the list to "None"
Once both are checked to none, it will no longer be a seeable option on the town halls.. making it unclickable.. and there will no longer be an option on your peasants.. this should solve your problem.. if not Please private message me and ill gladly do it for you mate ^^ good luck