Update options.d.ts

As per issue-vuejs#12488

Author: xonx4l

types/options.d.ts

@@ -210,7 +210,7 @@ export interface ComponentOptions<
   activated?(): void
   deactivated?(): void
   errorCaptured?(err: Error, vm: Vue, info: string): boolean | void
-  serverPrefetch?(this: V): Promise<void>
+  serverPrefetch?(): Promise<void>
   renderTracked?(e: DebuggerEvent): void
   renderTriggerd?(e: DebuggerEvent): void