Remove the dead static_npc_mobbase_race speeds loader

LOAD_ALL_MOBBASE_SPEEDS and MobBase.updateSpeeds have had no caller since
3.3 moved mob speeds to rune_speed. No value change.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/objects/MobBase.java

@@ -164,14 +164,6 @@ public class MobBase extends AbstractGameObject {
         return DbManager.MobBaseQueries.GET_MOBBASE(id);
     }
 
-    public void updateSpeeds(float walk, float walkCombat, float run, float runCombat) {
-        this.walk = walk;
-        this.walkCombat = walkCombat;
-        this.run = run;
-        this.runCombat = runCombat;
-
-    }
-
     /*
      * Getters
      */