feat(frontend): added activeClients array to state type

gmus-web/src/reducer/reducer.ts

@@ -16,6 +16,7 @@ export const nullPlayer: MusicPlayer = {
   currentTime: 0,
   seekTime: -1,
   master: '',
+  activeClients: [],
   queue: [],
 };
 

gmus-web/src/types/state.ts

@@ -9,5 +9,6 @@ export type MusicPlayer = {
   currentTime: number;
   seekTime: number;
   master: string;
+  activeClients: string[];
   queue: number[];
 };