Add GLOBE_ICON_FN to main.rc

[sdatkinson]

Description

Resolves #570

PR Checklist

• [N] Did you format your code using format.bash?
• Does the VST3 plugin pass all of the unit tests in the VST3PluginTestHost? (Download it as part of the VST3 SDK here.)
  • [Y] Windows
  • macOS
• [N] Does your PR add, remove, or rename any plugin parameters? If yes...
  • Have you ensured that the plug-in unserializes correctly?
  • Have you ensured that older versions of the plug-in load correctly? (See Unserialization.cpp.)

[sdatkinson]

Also added to the PR checklist so this hopefully doesn't happen again in the future