chore(Innertube#getSearchSuggestions): Use fetch_function instead of fetch

It is not an InnerTube request.

src/Innertube.ts

@@ -257,7 +257,12 @@ export default class Innertube {
     if (previous_query)
       url.searchParams.set('pq', previous_query);
 
-    const response = await this.#session.http.fetch(url);
+    const response = await this.#session.http.fetch_function(url, {
+      headers: {
+        'Cookie': this.#session.cookie || ''
+      }
+    });
+    
     const text = await response.text();
 
     const data = JSON.parse(text.replace('window.google.ac.h(', '').slice(0, -1));

src/core/Session.ts

@@ -225,6 +225,7 @@ export default class Session extends EventEmitter {
   public api_version: string;
   public account_index: number;
   public po_token?: string;
+  public cookie?: string;
 
   constructor(context: Context, api_key: string, api_version: string, account_index: number, player?: Player, cookie?: string, fetch?: FetchFunction, cache?: ICache, po_token?: string) {
     super();
@@ -239,6 +240,7 @@ export default class Session extends EventEmitter {
     this.context = context;
     this.player = player;
     this.po_token = po_token;
+    this.cookie = cookie;
   }
 
   on(type: 'auth', listener: OAuth2AuthEventHandler): void;