Fixed filter control placeholder text

[girishpanchal30]

All Submissions:

• Have you followed the Optimole Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

I reset the FilterMatchType value when the user changed the exclusions type.

Closes #683

How to test the changes in this Pull Request:

1. Open OPML settings.
2. Click the Advanced menu button.
3. Click the Exclusions submenu button.
4. Choose Page URL as the condition and select the matches option.
5. Now choose the Select filename option and ensure the placeholder displays word instead of path

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

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