sysutils/pwsafe: the port had been improved (+)

• Expand creator name to avoid confusion (single words are typically reserved for FreeBSD committers)
• Reword COMMENT to avoid contraction and improve readability
• Adjust LICENSE (it is "GPLv2 or later" in the source code)
• Simplify X11 disabling logic and convert to option helpers
• Drop redundant (inferred) GH_PROJECT knob while here