Update remmina to 1.4.20

Summary:
Summarized changelogs:

• 1.4.20:
  • XDMCP, NX and ST plugins are deprecated.
  • SSH tunnel MFA.
  • Adding connection profiles menu into the toolbar.
  • Some X11 related functions cleanup.
• 1.4.19:
  • UI improvements and cleanup.
  • Adding option to disable smooth scrolling.
  • Scrolled Viewport: use viewport_motion_handler as the only timeout indicator.
  • Adding TCP redirection through rdp2tcp.
  • Added setting for RDP number of reconnect attempts.
  • Add RDP reconnect interrupt on window close, fixes crash.
  • Removing GtkStatusIcon as deprecated.
  • Adding advanced option to share multiple folders.
  • Profile list grabs the focus when search is hidden.

Resolves T9805.

Test Plan:

1. Connected to remote computer using RDP plugin.
2. Connected to local VM using SPICE plugin.

Reviewers: Triage Team, JoshStrobl

Reviewed By: Triage Team, JoshStrobl

Subscribers: JoshStrobl

Maniphest Tasks: T9805

Differential Revision: https://dev.getsol.us/D11468