metar: fix pointer offset in metar_finishHEADmaster

The pointer offset for the `METAR/SPECI` search key is 6 characters too
short.

The search key is now `<raw_text>METAR KPDX` (21 chars), but the code
still advances by 15 characters, which was correct for the old format
`<raw_text>KPDX`

This lands the pointer on `KPDX 161753Z...` instead of `161753Z...`.
The regex parser skips the unrecognized tokens so it often still works,
but it passes garbage to metar_parse and could cause subtle parser
failures.

0 files changed, 0 insertions, 0 deletions