Fixed useless menu item

Removed useless line in .desktop files.

qubes-backup-restore.desktop

@@ -1,7 +1,6 @@
 [Desktop Entry]
 Type=Application
 Exec=qubes-backup-restore
-Path=/user/bin
 Icon=qubes-manager
 Terminal=false
 Name=Restore Backup

qubes-backup.desktop

@@ -1,7 +1,6 @@
 [Desktop Entry]
 Type=Application
 Exec=qubes-backup
-Path=/user/bin
 Icon=qubes-manager
 Terminal=false
 Name=Backup Qubes

qubes-global-settings.desktop

@@ -1,7 +1,6 @@
 [Desktop Entry]
 Type=Application
 Exec=qubes-global-settings
-Path=/user/bin
 Icon=qubes-manager
 Terminal=false
 Name=Qubes Global Settings