net/freerdp: recalculate checksum for patch.

For some reason, the patch in GH changed its size:

> Attempting to fetch https://github.com/FreeRDP/FreeRDP/commit/bfbef39759b9641a4fab8b75b9243c48cb0789ac.patch

fetch: https://github.com/FreeRDP/FreeRDP/commit/bfbef39759b9641a4fab8b75b9243c48cb0789ac.patch:
size mismatch: expected 2184, actual 2186

PR: 259740
Reported by: vvd@unislabs.com (maintainer)