fix: Move IS_DOWNLOAD_DONE logic inside methods (fossasia#2212)

Author: simarsingh24

android/app/src/main/java/org/fossasia/openevent/activities/MainActivity.java

@@ -191,7 +191,6 @@ protected void onCreate(Bundle savedInstanceState) {
         if (Utils.isBaseUrlEmpty()) {
             if (!SharedPreferencesUtil.getBoolean(ConstantStrings.IS_DOWNLOAD_DONE, false)) {
                 downloadFromAssets();
-                SharedPreferencesUtil.putBoolean(ConstantStrings.IS_DOWNLOAD_DONE, true);
             }
         } else {
             downloadData();
@@ -464,6 +463,7 @@ private void downloadFailed(final DownloadEvent event) {
             else
                 OpenEventApp.postEventOnUIThread(event);
         }).show();
+        SharedPreferencesUtil.putBoolean(ConstantStrings.IS_DOWNLOAD_DONE, false);
 
     }
 
@@ -836,6 +836,7 @@ public void downloadFromAssets() {
         } else {
             completeHandler.hide();
         }
+        SharedPreferencesUtil.putBoolean(ConstantStrings.IS_DOWNLOAD_DONE, true);
     }
 
     public void readJsonAsset(final String name) {