Allow user to change max search results

[Subtixx]

Currently, the extension has a fixed limit on the number of search results returned by KDE baloo indexing service. This limit may not suit all users' needs and can restrict the usability of the extension.

Steps to Reproduce

• Perform a search using the ulauncher extension.
• Observe that the number of search results is capped at a specific limit.

Expected Outcome

Users should have the ability to configure the maximum number of search results to better suit their preferences and requirements.

Actual Outcome

The maximum number of search results is fixed to 10 and cannot be changed by the user.

Possible Solution

Implement a configuration option in the extension settings that allows users to specify the maximum number of search results.