Finish enabling hidden QSP in User Script List pages

[Martii]

• Turns library into a tri-state, but only on User Script List pages
• Missed a few labels too in Enable the missing library QSP on User home pages #777
• Commented it as much as I can for clarity for those not familiar with multi-state QSP's
• Kept the view duplicated for clarity... does make twice the management task but this should be low-maintenance e.g. won't change much (tiny bit easier to read too with those mu2 conditionals ;)

Post #643

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How this works

For everyone:

• https://openuserjs.org/users/Marti/scripts ... the current, long time, default... show userscripts and libraries
• https://openuserjs.org/users/Marti/scripts?library=true ... only show that users libraries
• https://openuserjs.org/users/Marti/scripts?library=false ... only show that users userscripts

... possible addition of a nav dropdown if anyone desires.

May be modified by those with Mod permissions to include the flagged QSP with returning those lists:

• https://openuserjs.org/users/Marti/scripts?flagged=true
• https://openuserjs.org/users/Marti/scripts?library=true&flagged=true
• https://openuserjs.org/users/Marti/scripts?library=false&flagged=true

... and for Admins+ when #641 is fini'd:

• https://openuserjs.org/users/Marti/scripts?flagged=absolute
• https://openuserjs.org/users/Marti/scripts?library=true&flagged=absolute
• https://openuserjs.org/users/Marti/scripts?library=false&flagged=absolute