fix: inconsistency with the select all functionality in problem capa type filter (openedx#1294)

Author: ChrisChV

src/search-manager/FilterByBlockType.tsx

@@ -53,6 +53,7 @@ const ProblemFilterItem = ({ count, handleCheckboxChange } : ProblemFilterItemPr
 
   const handleCheckBoxChangeOnProblem = React.useCallback((e) => {
     handleCheckboxChange(e);
+    setIsProblemIndeterminate(false);
     if (e.target.checked) {
       setProblemTypesFilter(Object.keys(problemTypes));
     } else {