Fix button alignment and change external icon in Tools List

[ahmedhamidawan]

Changes made to the Tools List/Results page (Fixes #15258):

Changed External button icon

Before	After

Fixed button alignment

Before	After

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.

[ahmedhamidawan]

Unrelated Selenium failure: FAILED test/integration_selenium/test_history_import_export_ftp.py::TestHistoryImportExportFtpSeleniumIntegrationWithTasks::test_history_export_tracking

[guerler]

Thank you!