Add: [CN] event_20200723_cn B3 D3

- Fix homography error when no edge detected
- Increase battle function try count, just for pool logic currently

module/campaign/campaign_base.py

@@ -105,7 +105,7 @@ class CampaignBase(Map):
         self.handle_fleet_reverse()
         self.map_init(self.MAP)
 
-        for _ in range(20):
+        for _ in range(50):
             try:
                 self.execute_a_battle()
             except CampaignEnd: