Fix: Change button cursor to pointer on hover

[Mujtaba500]

What kind of change does this PR introduce?

Bug fix

Why was this change needed?

Fixes #360

Other information:

Before:

postiz-button-hover-b.webm

After:

postiz-button-hover-a.webm

Checklist:

• I have read the CONTRIBUTING guide.
• I checked that there were not similar issues or PRs already open for this.
• This PR fixes just ONE issue (do not include multiple issues or types of change in the same PR) For example, don't try and fix a UI issue and include new dependencies in the same PR.

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[nevo-david]

Thank you for the good fix, merged!