Rename methods in ModulesJson

[ErikDanielsson]

Renamed methods names in ModulesJson to not explicitly reference modules.json. This should have been done in #1655.

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[codecov]

Codecov Report

Merging #1672 (38de526) into dev (77f43e8) will not change coverage.
The diff coverage is 89.65%.

@@           Coverage Diff           @@
##              dev    #1672   +/-   ##
=======================================
  Coverage   68.07%   68.07%           
=======================================
  Files          56       56           
  Lines        6588     6588           
=======================================
  Hits         4485     4485           
  Misses       2103     2103           

Impacted Files	Coverage Δ
nf_core/modules/modules_command.py	87.80% <0.00%> (ø)
nf_core/modules/remove.py	80.55% <66.66%> (ø)
nf_core/modules/modules_json.py	63.26% <94.11%> (ø)
nf_core/lint/modules_json.py	80.76% <100.00%> (ø)
nf_core/modules/install.py	73.07% <100.00%> (ø)
nf_core/modules/lint/__init__.py	82.85% <100.00%> (ø)
nf_core/modules/list.py	71.62% <100.00%> (ø)
nf_core/modules/update.py	65.06% <100.00%> (ø)

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[ErikDanielsson]

Thanks!