Registers an offence even if the line includes a end-of-line # comment

[hoshinotsuyoshi]

While using rubocop-grep, I realized that lines with end-of-line # comments cannot be detected by rubocop as violations, even if they do violate a rule.

I have expressed this behavior in a spec. The current codebase does not pass this test.

  context 'with a simple config' do
    let(:cop_config) { {
      'Rules' => [
        { 'Pattern' => 'foo', 'Message' => 'foo is bad' },
      ],
    } }

    ....
    it 'registers an offence even if the line includes a end-of-line # comment' do
      expect_offense(<<~RUBY)
        foo bar # comment
        ^^^ foo is bad
      RUBY
    end

This PR resolves this issue.

[hoshinotsuyoshi]

Added the condition:

c.loc.expression.begin_pos <= pos[:column]

For example, if the source is foo bar # comment,

• At what character the search target word starts = position of foo ( = 0)
  and
• At what character the comment starts = position of # (= 8)

are comparing.