Fix the bug that fillRequestOptions() does not respect method option

[Leo-768]

It may cause 414 (URI Too Long) error for massQuery().

[siddharthvp]

I don't think there's a bug. getMethod()'s return value is overwritten by the provided requestOptions in fillRequestOptions().

[Leo-768]

The variable "method" itself won't be overwritten, so the program will call handleGet() instead of handlePost(). That's the reason why the 414 (URI Too Long) error may happen.

mwn/src/core.ts

Lines 92 to 96 in 5975811

	if (method === 'get') {
	this.handleGet();
	} else {
	await this.handlePost();
	}

[siddharthvp]

Indeed, thanks for catching this!