Changed base class from Form to FormBase for 7 forms:
- ArchiveChooser
- FFmpegWriterForm
- GifWriterForm
- JmdForm
- SynclessRecordingTools
- AutofireConfig
- ControllerConfig

Part of TASEmulators#4005. The remaining forms can follow in subsequent PRs.

Address @YoshiRulz's review on TASEmulators#4690. Changing the supertype alone was
not enough: FormBase's WindowTitleStatic throws NotImplementedException
by default (it is virtual instead of abstract only because the Designer
does not tolerate abstract), and FormBase's Text setter throws
InvalidOperationException when hit outside DesignMode. Without the
override, every one of these forms would throw on OnLoad before being
shown.

For each of the seven forms in this batch, add
  protected override string WindowTitleStatic => "<title>";
using the title that was previously set in the Designer, and remove the
`this.Text = "<title>";` line from the Designer (it would throw at
runtime now that the supertype's Text setter is guarded).

Fixed forms:

- ArchiveChooser: "Choose File From Archive"
- FFmpegWriterForm: "Choose Video Format"
- GifWriterForm: "GIF Writer Options"
- JmdForm: "JMD Compression Options"
- SynclessRecordingTools: "Syncless Recording"
- AutofireConfig: "Autofire Configuration"
- ControllerConfig: "Controller Config"

Honest note on testing: BizHawk is a Windows host and I am on macOS
without a working .NET build, so I cannot run these forms interactively
or exercise the Alt+key mnemonics end-to-end from here. The pattern
follows existing FormBase-derived forms (CDL, HexEditor, GBAGPUView,
etc.) that already override WindowTitleStatic and do not set
`this.Text` in their designers.