Fix native 2K resolution selection for Wyze Bulb Cam HL_BC - #2497

The native Wyze source requests the wrong HD resolution for HL_BC, leaving
the camera at 640×360. This model requires K10056 wire resolution byte 5,
the existing FrameSizeFloodlight enum value 4, to serve 2304×1296.

Select that frame size in hdFrameSize() for HL_BC. The existing K10056
payload, bitrate setting, authentication, and TUTK channel work unchanged.
Adding HL_BC to is2K() alone selects wire byte 4 and does not fix it.

Verified on a physical HL_BC running firmware 21.1.6.1161:

• Wire values 1 and 4 leave the stream at 640×360 despite a success ACK.
• Payload 05 f0 00 00 00 returns 01; K10050 readback returns
  f0 00 05 14 01 01 (bitrate 240, resolution 5, 20 fps).
• A two-minute recording through the patched native source, RTSP restream,
  and Frigate input measured 2304×1296, nominal 20 fps, approximately 1.53 Mbps.
• go test ./pkg/wyze ./pkg/tutk/... passes, and the binary builds.

The recording decoded without warnings, but native packet-fragment loss
caused missing keyframes and temporal gaps. This resolution change does not
claim to fix transport loss or prove equivalence to the app's image quality.

Related to #2314.