Fix Duplicate Egg Moves (#736)

Fixes an issue where egg moves could get duplicated onto a starter Pokémon's moveset.

src/ui/starter-select-ui-handler.ts

@@ -1576,6 +1576,12 @@ export default class StarterSelectUiHandler extends MessageUiHandler {
         if (this.starterMoveset.length < 4 && this.starterMoveset.length < availableStarterMoves.length)
           this.starterMoveset.push(...availableStarterMoves.filter(sm => this.starterMoveset.indexOf(sm) === -1).slice(0, 4 - this.starterMoveset.length));
         
+        // Remove duplicate moves
+        this.starterMoveset = this.starterMoveset.filter(
+          (move, i) => {
+            return this.starterMoveset.indexOf(move) === i;
+          }) as StarterMoveset;        
+
         const speciesForm = getPokemonSpeciesForm(species.speciesId, formIndex);
         
         const formText = species?.forms[formIndex]?.formKey.split('-');