Update facet pagination to fix #5549

[abelemlih]

Fixes #5549

Fixes the logic for displaying Previous and Next buttons in hyrax/app/views/hyrax/my/_facet_pagination.html.erb. This ensures two random span tags are no longer displayed. Refer to the following screenshots for the UI changes included in this PR:

Before the fix:

After the fix:

Changes proposed in this pull request:

• In hyrax/app/views/hyrax/my/_facet_pagination.html.erb, only display a disabled Previous button if the current page is the first page
• In hyrax/app/views/hyrax/my/_facet_pagination.html.erb, only display a disabled Next button if the current page is the last page

Guidance for testing, such as acceptance criteria or new user interface behaviors:

1. Go to Dashboard
2. Go to Works
3. Click on Resource Type filter
4. Click more >>

• Ensure Previous button is disabled if current page is the first page
• Ensure Next button is disabled if current page is the last page
• Ensure Previous and Next button work properly when there are multiple pages of resource types to filter works

@samvera/hyrax-code-reviewers

[kirkkwang]

Hey thanks for making the PR, looks good to me!