Fixed crash where deleting mods meant you could never start a game again

If the last game you created used a mod that you later removed from the the device it could never be removed from the new game parameters
Caught exceptions from quickstart failing

android/assets/jsons/translations/template.properties

@@ -657,7 +657,8 @@ Main menu =
 Resume = 
 Cannot resume game! = 
 Not enough memory on phone to load game! = 
-Quickstart = 
+Quickstart =
+Cannot start game with the default new game parameters! = 
 Victory status = 
 Social policies = 
 Community = 

core/src/com/unciv/MainMenuScreen.kt

@@ -236,8 +236,12 @@ class MainMenuScreen: CameraStageBaseScreen() {
     }
 
     private fun quickstartNewGame() {
-        val newGame = GameStarter.startNewGame(GameSetupInfo.fromSettings("Chieftain"))
-        game.loadGame(newGame)
+        try {
+            val newGame = GameStarter.startNewGame(GameSetupInfo.fromSettings("Chieftain"))
+            game.loadGame(newGame)
+        } catch (ex: Exception) {
+            ToastPopup("Cannot start game with the default new game parameters!", this)
+        }
     }
 
     override fun resize(width: Int, height: Int) {

core/src/com/unciv/logic/GameStarter.kt

@@ -32,6 +32,10 @@ object GameStarter {
         val gameInfo = GameInfo()
         lateinit var tileMap: TileMap
 
+        // In the case where we used to have a mod, and now we don't, we cannot "unselect" it in the UI.
+        // We need to remove the dead mods so there aren't problems later.
+        gameSetupInfo.gameParameters.mods.removeAll{ !RulesetCache.containsKey(it) }
+
         gameInfo.gameParameters = gameSetupInfo.gameParameters
         val ruleset = RulesetCache.getComplexRuleset(gameInfo.gameParameters.mods)