Fix the checkpoint quick pick button icons by swapping the star icons used for starring and unstarring

Author: robertpiosik

packages/vscode/src/commands/checkpoints-command/checkpoints-command.ts

@@ -131,7 +131,7 @@ export const checkpoints_command = (
                 buttons: [
                   {
                     iconPath: new vscode.ThemeIcon(
-                      c.starred ? 'star-full' : 'star-empty'
+                      c.starred ? 'star-empty' : 'star-full'
                     ),
                     tooltip: c.starred ? 'Unstar' : 'Star'
                   },