terser: use 2 passes instead of the default 1.

Saves us a few bytes.

package.json

@@ -37,9 +37,9 @@
     "js-compile-plugins": "node build/build-plugins.js",
     "js-lint": "eslint --cache --cache-location .cache/.eslintcache --report-unused-disable-directives .",
     "js-minify": "npm-run-all --parallel js-minify-*",
-    "js-minify-standalone": "terser --compress --mangle --comments \"/^!/\" --source-map \"content=dist/js/bootstrap.js.map,includeSources,url=bootstrap.min.js.map\" --output dist/js/bootstrap.min.js dist/js/bootstrap.js",
-    "js-minify-standalone-esm": "terser --compress --mangle --comments \"/^!/\" --source-map \"content=dist/js/bootstrap.esm.js.map,includeSources,url=bootstrap.esm.min.js.map\" --output dist/js/bootstrap.esm.min.js dist/js/bootstrap.esm.js",
-    "js-minify-bundle": "terser --compress --mangle --comments \"/^!/\" --source-map \"content=dist/js/bootstrap.bundle.js.map,includeSources,url=bootstrap.bundle.min.js.map\" --output dist/js/bootstrap.bundle.min.js dist/js/bootstrap.bundle.js",
+    "js-minify-standalone": "terser --compress passes=2 --mangle --comments \"/^!/\" --source-map \"content=dist/js/bootstrap.js.map,includeSources,url=bootstrap.min.js.map\" --output dist/js/bootstrap.min.js dist/js/bootstrap.js",
+    "js-minify-standalone-esm": "terser --compress passes=2 --mangle --comments \"/^!/\" --source-map \"content=dist/js/bootstrap.esm.js.map,includeSources,url=bootstrap.esm.min.js.map\" --output dist/js/bootstrap.esm.min.js dist/js/bootstrap.esm.js",
+    "js-minify-bundle": "terser --compress passes=2 --mangle --comments \"/^!/\" --source-map \"content=dist/js/bootstrap.bundle.js.map,includeSources,url=bootstrap.bundle.min.js.map\" --output dist/js/bootstrap.bundle.min.js dist/js/bootstrap.bundle.js",
     "js-test": "npm-run-all --parallel js-test-karma js-test-jquery js-test-integration-*",
     "js-debug": "cross-env DEBUG=true npm run js-test-karma",
     "js-test-karma": "karma start js/tests/karma.conf.js",