Allow the "scan is slowing down" message to be cleared when not relevant anymore

Author: payne911

website/src/queries-init.js

@@ -23,7 +23,6 @@ const UF_PRESERVED_MSGS = [
     UF_MSG_NO_FORKS,
     UF_MSG_EMPTY_FILTER,
     UF_MSG_ERROR,
-    UF_MSG_SLOWER,
     UF_MSG_API_RATE
 ];