Add integer-only input field for plugin settings in Remmina Editor

Description

As discussed in !2301 (merged): The Remmina profiles editor needs an input field which only accepts integers.

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

  • My code follows the code style of this project.
  • My change requires a change to the documentation.
  • I have updated the documentation accordingly.
Edited by Daniel Teichmann

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