style(build): add blank line after multi-line renderFrame closure

SwiftFormat's blankLinesBetweenScopes rule treats the multi-line
'let permissionFrame = renderFrame { ... }' block as a scope and
requires a blank line before the following writeGIF call. The other
gif blocks use single-line .map { ... } expressions and don't trip
the rule.

Author: pasrom

scripts/generate_menu_bar_gifs.swift

@@ -262,6 +262,7 @@ let permissionFrame = renderFrame { rect in
     drawIdle(in: rect)
     drawExclamationBadge(in: rect)
 }
+
 writeGIF(name: "menu-bar-permission.gif", frames: [permissionFrame, permissionFrame], delay: 1.0)
 
 print("Done!")