fix: Enable reloading when pulling in EventsFragment (#1660)

Details:
- Clear last search variable so that events are fetched again in EventsViewModel

Fixes #1657

Author: anhanh11001

app/src/main/java/org/fossasia/openevent/general/event/EventsFragment.kt

@@ -151,6 +151,7 @@ class EventsFragment : Fragment(), ScrollToTop {
         rootView.swiperefresh.setOnRefreshListener {
             showNoInternetScreen(!eventsViewModel.isConnected())
             eventsViewModel.clearEvents()
+            eventsViewModel.clearLastSearch()
             if (!eventsViewModel.isConnected()) {
                 rootView.swiperefresh.isRefreshing = false
             } else {

app/src/main/java/org/fossasia/openevent/general/event/EventsViewModel.kt

@@ -59,6 +59,8 @@ class EventsViewModel(
                     mutableError.value = resource.getString(R.string.error_fetching_events_message)
                 })
             )
+        } else {
+            mutableProgress.value = false
         }
     }
 
@@ -68,6 +70,10 @@ class EventsViewModel(
         mutableEvents.value = null
     }
 
+    fun clearLastSearch() {
+        lastSearch = ""
+    }
+
     fun loadEvents() {
         compositeDisposable.add(eventService.getEvents()
             .subscribeOn(Schedulers.io())