Revert "chore: upgrade frontend lib learning assistant version (#1590)" (#1592)

This reverts commit e34d18d.

Author: varshamenon4

package-lock.json

@@ -37,7 +37,7 @@
     "@edx/brand": "npm:@openedx/brand-openedx@^1.2.2",
     "@edx/browserslist-config": "1.4.0",
     "@edx/frontend-component-header": "^5.8.0",
-    "@edx/frontend-lib-learning-assistant": "^2.18.0",
+    "@edx/frontend-lib-learning-assistant": "^2.14.2",
     "@edx/frontend-lib-special-exams": "^3.1.3",
     "@edx/frontend-platform": "^8.0.0",
     "@edx/openedx-atlas": "^0.6.0",