Fix WPA-sec credential identity parsing

[newfpv]

What changed

• parse WPA-sec result lines whose BSSID and station fields use compact 12-hex MAC notation
• preserve the exact BSSID instead of producing Name-only credential records
• merge identical WPA-sec and other-source credentials by BSSID/password
• keep access points with the same ESSID/password separate when their BSSIDs differ
• preserve passwords containing colons
• bump PWMenu to 1.3.8 and update the tagged install URL and changelog

Root cause

WPA-sec downloads BSSID:STATION:ESSID:PASSWORD with compact MAC fields such as aabbccddeeff. PWMenu only accepted colon-delimited MAC fields, so it fell back to an ESSID/password-only parser and discarded the BSSID.

Validation

• python -m unittest discover -s tests -v
• 52 tests passed, including three new WPA-sec compact-potfile regression tests
• git diff --check passed