Fix endless methods

[qaisjp]

One of the tests are currently failing:

  formatter tests
    ✔ adds "end" to an if block
    ✔ adds an "end" to an assignment method
    ✔ doesn't add end if it exists already
    ✔ doesn't add end when there's already one on the same line - if foo; end$
    ✔ doesn't add end when there's already one on the same line - if foo; end;$
    ✔ doesn't add end when there's already one on the same line - if foo; end ; foo()$
    1) doesn't add end for endless methods — def foo =$
    ✔ doesn't add end for endless methods — def foo = $
    ✔ doesn't add end for endless methods — def foo = bar$
    ✔ support nested blocks, add end
    ✔ support nested blocks, does not add end
    ✔ does not add end with a return if statement
    ✔ does not add end to a random statement even a portion of a trigger keyword is in it
  12 passing (68ms)
  1 failing
  1) formatter tests
       doesn't add end for endless methods — def foo =$:

  AssertionError [ERR_ASSERTION]:
  	at Context.<anonymous> (out/test/extension.test.js:81:20)

1 test failed.

I also think the regex doesn’t work well when the cursor is in the middle of the line, and not at EOL.