Use consistent bash5 style for conditionals and quoting

bin/omarchy-dev-add-migration

@@ -7,7 +7,7 @@ cd ~/.local/share/omarchy
 migration_file="$HOME/.local/share/omarchy/migrations/$(git log -1 --format=%cd --date=unix).sh"
 touch $migration_file
 
-if [[ "$1" != "--no-edit" ]]; then
+if [[ $1 != "--no-edit" ]]; then
   nvim $migration_file
 fi