update f5bigipasm detect pattern

[hewen-lotus]

Some people use custom page on BIG-IP ASM, then the original schemes will not compare. BIG-IP ASM system sets cookies begin with TS, the number of subsequent digits varies with the version, so I append the schema2 pattern.

ref: https://support.f5.com/csp/article/K6850#main

Which category is this pull request?

• [ ] A new feature/enhancement.
• [ ] Fix an issue/feature-request.
• [x] An improvement to existing modules.
• [ ] Other (Please mention below).

Where has this been tested?

• Python Version
  • [x] v3.x
  • [ ] v2.x
• Operating System:
  • [ ] Linux (Please specify distro)
  • [x] Windows
  • [ ] MacOS

Does this close any currently open issues?

[Mention any issue which this PR closes] NO

Does this add any new dependency?

[Mention if this PR includes any new library] NO

Does this add any new command line switch/argument?

[Mention if the changes add any new arguments like --arg] NO

Any other comments you would like to make?

[Anything more you'd want the reviewer to know] NO

[0xInfection]

Tested this and looks good. Also didn't notice a lot of sites using the TS* cookie, so most prolly not subject to false positives. Merging this for now, we'll revisit this if an issue gets pulled up in future. :)