Consider trimming button locator text

[cowboyd]

Just ran into this issue when trying out tests on Safari:

  ↪ visiting "/"
    ⨯ Sign in to FOLIO
      │ ERROR did not find button "Log in", did you mean one of:
      │
      │ ┃ button               ┃ visible: true ┃
      │ ┣━━━━━━━━━━━━━━━━━━━━━━╋━━━━━━━━━━━━━━━┫
      │ ┃ ⨯ "Log in\n"         ┃ ✓ true        ┃
      │ ┃ ⨯ "Forgot password?" ┃ ✓ true        ┃
      │ ┃ ⨯ "Forgot username?" ┃ ✓ true        ┃

As you can see, the only reason that the locators didn't match was because of the trailing "\n" which apparently the Safari DOM preserves for innerText and gecko and chrome do not.

[jnicklas]

Duplicate of #25