Fix fully evolved species with mega evolutions treated as middle for fusions

src/data/pokemon-species.ts

@@ -311,7 +311,7 @@ export default class PokemonSpecies extends PokemonSpeciesForm {
       }
     }
 
-    if (!allowEvolving || !pokemonEvolutions.hasOwnProperty(this.speciesId) || !pokemonEvolutions[this.speciesId].filter(e => !e.evoFormKey || e.evoFormKey.indexOf(SpeciesFormKey.MEGA) === -1).length)
+    if (!allowEvolving || !pokemonEvolutions.hasOwnProperty(this.speciesId) || !pokemonEvolutions[this.speciesId].find(e => !e.evoFormKey || e.evoFormKey.indexOf(SpeciesFormKey.MEGA) === -1))
       return this.speciesId;
 
     const evolutions = pokemonEvolutions[this.speciesId];