Add enum value for decapitation game mode

Author: Askaholic

migrations/V135__add_decapitation_victory_condition.sql

@@ -0,0 +1,26 @@
+ALTER TABLE game_stats
+  MODIFY `gameType` enum(
+    '0',
+    '1',
+    '2',
+    '3',
+    'DEMORALIZATION',
+    'DOMINATION',
+    'ERADICATION',
+    'SANDBOX',
+    'DECAPITATION'
+  ) NOT NULL,
+
+UPDATE game_stats set `gameType` = 'DEMORALIZATION' where `gameType` = '0';
+UPDATE game_stats set `gameType` = 'DOMINATION' where `gameType` = '1';
+UPDATE game_stats set `gameType` = 'ERADICATION' where `gameType` = '2';
+UPDATE game_stats set `gameType` = 'DECAPITATION' where `gameType` = '3';
+
+ALTER TABLE game_stats
+  MODIFY `gameType` enum(
+    'DEMORALIZATION',
+    'DOMINATION',
+    'ERADICATION',
+    'SANDBOX',
+    'DECAPITATION'
+  ) NOT NULL,