Use exact mode when user explicitly filters on a column

Summary: Using substring doesnt make sense for these actions. As you say I want to filer on this cell but it includes many others

Reviewed By: aigoncharov

Differential Revision: D48515476

fbshipit-source-id: b7a77c022052bb33e2ce2a3f656dabab114d8a78

desktop/flipper-plugin/src/ui/data-table/DataTableManager.tsx

@@ -353,6 +353,7 @@ export const dataTableManagerReducer = produce<
           getValueAtPath(item, String(action.column)),
           {
             disableOthers: index === 0, // remove existing filters before adding the first
+            exact: true,
           },
         );
       });