package.json: fix clean-css level switch

This didn't have any effect since O1 is the default, but regardless it was the wrong switch.

package.json

@@ -25,7 +25,7 @@
     "css-lint": "npm-run-all --continue-on-error --parallel css-lint-*",
     "css-lint-stylelint": "stylelint \"**/*.{css,scss}\" --cache --cache-location .cache/.stylelintcache --rd",
     "css-lint-vars": "fusv scss/ site/assets/scss/",
-    "css-minify": "cleancss --level 1 --format breakWith=lf --source-map --source-map-inline-sources --output dist/css/bootstrap.min.css dist/css/bootstrap.css && cleancss --level 1 --format breakWith=lf --source-map --source-map-inline-sources --output dist/css/bootstrap-grid.min.css dist/css/bootstrap-grid.css && cleancss --level 1 --format breakWith=lf --source-map --source-map-inline-sources --output dist/css/bootstrap-utilities.min.css dist/css/bootstrap-utilities.css && cleancss --level 1 --format breakWith=lf --source-map --source-map-inline-sources --output dist/css/bootstrap-reboot.min.css dist/css/bootstrap-reboot.css",
+    "css-minify": "cleancss -O1 --format breakWith=lf --source-map --source-map-inline-sources --output dist/css/bootstrap.min.css dist/css/bootstrap.css && cleancss -O1 --format breakWith=lf --source-map --source-map-inline-sources --output dist/css/bootstrap-grid.min.css dist/css/bootstrap-grid.css && cleancss -O1 --format breakWith=lf --source-map --source-map-inline-sources --output dist/css/bootstrap-utilities.min.css dist/css/bootstrap-utilities.css && cleancss -O1 --format breakWith=lf --source-map --source-map-inline-sources --output dist/css/bootstrap-reboot.min.css dist/css/bootstrap-reboot.css",
     "css-prefix": "npm-run-all --parallel css-prefix-*",
     "css-prefix-main": "postcss --config build/postcss.config.js --replace \"dist/css/*.css\" \"!dist/css/*.min.css\"",
     "css-prefix-examples": "postcss --config build/postcss.config.js --replace \"site/content/**/*.css\"",