Update AllCombinationsOfSizeK.js

[imrahulkb]

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Describe your change:

This PR modifies a current algorithm for AllCombinationsOfSizeK. Four parameters made up the original findCombinations() method, and they were duplicated for each stack call. Since the modifications are kept in the instance variables, the modified findCombinations() method does not require any parameters. In this case, there will be far fewer local variables that need to be initialized overall on each recursive call.
There was also a for loop in the original technique. The updates function is entirely recursive and lacks a for loop.

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new JavaScript files are placed inside an existing directory.
• All filenames should use the UpperCamelCase (PascalCase) style. There should be no spaces in filenames.
  Example:UserProfile.js is allowed but userprofile.js,Userprofile.js,user-Profile.js,userProfile.js are not
• All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[appgurueu]

Looks good, however formatting seems broken. If you're already refactoring this, could you get rid of the class entirely? This should be a single function taking n and k as parameters instead. Ideally the API should also be a generator rather than producing a list.

[appgurueu]

You'll need to fix the tests, though. They currently still expect a class.

[imrahulkb]

I am not able to get that why there is code style error in this pull request