refactor(coap-server): simplify form generation

[JKRhb]

While preparing to implement #1014, I noticed that there is actually some room for simplification in the current CoAP server implementation. This PR makes the corresponding changes, getting rid of two unnecessary helper functions I previously introduced.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.04% ⚠️

Comparison is base (0cbecdc) 75.35% compared to head (9d22472) 75.31%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1084      +/-   ##
==========================================
- Coverage   75.35%   75.31%   -0.04%     
==========================================
  Files          80       80              
  Lines       16083    16060      -23     
  Branches     1503     1503              
==========================================
- Hits        12119    12096      -23     
  Misses       3925     3925              
  Partials       39       39              

Files Changed	Coverage Δ
packages/binding-coap/src/coap-server.ts	78.37% <100.00%> (-0.57%)	⬇️

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[relu91]

LGTM, just one question. You removed the port parameter because it was only used to log the Href Assignment and it could have been retrieved using this.port right?

[JKRhb]

LGTM, just one question. You removed the port parameter because it was only used to log the Href Assignment and it could have been retrieved using this.port right?

Exactly :)

[JKRhb]

Given @relu91's approval, I would merge this one, hope that's fine :)