Revert "gm-fetch für Firefox gefixt"

This reverts commit 20e011bb55.

src/call-history.ts

@@ -1,7 +1,7 @@
 import * as chrono from 'chrono-node'
 import { TapiContact } from './tapi-contact'
 import { extractNumber } from './utils'
-import GM_fetch from './gm-fetch'
+import GM_fetch from '@trim21/gm-fetch'
 
 export class CallHistory {
   private callerIds: { [number: string]: TapiContact } = {}