Update shield and natural regen defaults

assets/robocraft/config.json

@@ -14418,9 +14418,9 @@
     "lerp_value": 0.1,
     "battle": {
         "regen": {
-            "wait_for_heal_s": 5.0,
+            "wait_for_heal_s": 10.0,
             "wait_full_heal_s": 5.0,
-            "sound_start_s": 2.5,
+            "sound_start_s": 7.5,
             "auto_heal": true
         },
         "votes": {