[redgifs] fix 'token' extraction

[enduser420]

Closes #3080

https://github.com/Redgifs/api/wiki/Temporary-tokens

if (g instanceof FormData || g instanceof URLSearchParams || m.append('Content-Type', 'application/json'), !u) {
    const e = l || await Object(n['f'])();
    if (e) m.append('Authorization', 'Bearer ' + e);
    else {
        const e = await this.getTemporaryToken();
        e && m.append('Authorization', 'Bearer ' + e)
    }
}

async getTemporaryToken() {
    if (!this.temporaryToken) {
        const e = await this._request('GET', '/v2/auth/temporary', {
        }, {
            anon: !0
        });
        this.temporaryToken = e.token,
            console.debug('[auth] temporary token updated = ' + this.temporaryToken)
    }
    return this.temporaryToken
}

[mikf]

Thank you for the quick fix, but I'd rather do this a slightly different way than it was before, given that the new tokens are temporary and might expire rather quickly. (04d3ebd)