Dropped support notification screenshots

Screenshots for strings added in !100 (merged)

screenshots/dropped-support-notification-macos-expired.png is for:

• dropped-support-notification-macos-version-less-than-10-15-expired.

screenshots/dropped-support-notification-macos.png is for:

• dropped-support-notification-macos-version-less-than-10-15.
• dropped-support-notification-dismiss-button.

screenshots/dropped-support-notification-windows-expired.png is for:

• dropped-support-notification-win-os-version-less-than-10-expired

screenshots/dropped-support-notification-windows.png is for:

• dropped-support-notification-win-os-version-less-than-10.
• dropped-support-notification-dismiss-button.