Move dev option to approporiate location

[GedasGa]

Platforms affected

electron

Motivation and Context

devTools option can be set inside webPreferences. Therefore, we can deleteisRelease option and set devTools option inside webPreferences instead.

Description

• Move dev option to the appropriate location.
• Update tests.

Testing

npm t

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-io]

Codecov Report

Merging #11 into support-user-defined-electron-settings will not change coverage.
The diff coverage is 100%.

@@                          Coverage Diff                          @@
##           support-user-defined-electron-settings    #11   +/-   ##
=====================================================================
  Coverage                                     100%   100%           
=====================================================================
  Files                                          14     14           
  Lines                                         568    568           
=====================================================================
  Hits                                          568    568

Impacted Files	Coverage Δ
bin/templates/cordova/lib/SettingJsonParser.js	100% <100%> (ø)	⬆️

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