Fix hardware profiles for H265 templates

[MPTres]

Streaming fails when using the default h265/videtoolbox template (in a mac). It shows this error:

[hevc_videotoolbox @ 0x7fb602b08300] [Eval @ 0x7ff7b834a380] Undefined constant or missing '(' in 'high'
[hevc_videotoolbox @ 0x7fb602b08300] Unable to parse option value "high"
[hevc_videotoolbox @ 0x7fb602b08300] Error setting option profile to value high.
[vost#0:0/hevc_videotoolbox @ 0x7fb602b07b80] Error initializing output stream: 
Error while opening encoder for output stream #0:0 - maybe incorrect parameters
 such as bit_rate, rate, width or height

Current template:
h265/videotoolbox": "-c:v hevc_videotoolbox -g 50 -bf 0 -profile:v high -level:v 5.1

The problem is the -profile:v parameter, because high is not a valid option.
The valid options for that value in ffmpeg are:

 -profile           <int64>      E..V....... Profile (from 0 to 3) (default 0)
     main                         E..V....... Main Profile
     main10                       E..V....... Main10 Profile

That should be an integer from 0 to 3, or the literals main or main10. Did not send a PR because i have no idea which profile is the equivalent to h264's high :)

[AlexxIT]

https://github.com/AlexxIT/go2rtc/releases/tag/v1.8.5