capdev-proc: Apply protocol filter

[norihiro]

The necessary protocol is only 0x8819. Do not capture other packets.

General checkpoints

• [x] The commit is reviewed by yourself.
• [x] The code is tested.
• [x] Document is up to date or not necessary to be changed.
• [x] The commit is compatible with repository's license.

[norihiro]

Confirmed operation with macOS, Intel (x86_64).

[obs-h8819-source] h8819[en4]: 55955 packets received, 0 packets dropped
14:07:48.701: All scene data cleared