refactor: update from peer review

Co-authored-by: antazoey <admin@antazoey.me>

Author: fubuloubu

ape_safe/accounts.py

@@ -872,7 +872,7 @@ def add_signatures(
             if signature := acc.sign_message(safe_tx):
                 new_signatures[acc.address] = signature
                 confirmations_needed -= 1
-                if confirmations_needed == 0:
+                if confirmations_needed <= 0:
                     break
 
             # else: didn't want to sign