[common] fix load old level format

src/common/haxe/ru/m/tankz/util/LevelUtil.hx

@@ -40,7 +40,10 @@ class LevelUtil {
     }
 
     public static function loads(data:String):LevelConfig {
-        try {
+        // If first char is digit load as old format
+        if (Std.parseInt(data.charAt(0)) != null) {
+            return loadsOld(data);
+        } else {
             var obj:LevelSource = Yaml.parse(data, Parser.options().useObjects());
             return {
                 data: obj.data.split('').map(function(c) return Std.parseInt(c)),
@@ -48,8 +51,6 @@ class LevelUtil {
                 name: obj.name,
                 size: obj.size,
             }
-        } catch (error:Dynamic) {
-            return loadsOld(data);
         }
     }