Enable tapping on channels when jump to textfield is focused. (#2535)

* Allow tapping on channels in the filtered list …

… when the keyboard is open. This option also allows tapping on non-interactive areas to still dismiss the keyboard.

* keyboard propery updates

- change ‘on-drag’ to ‘interractive’
- change ‘handled’ to ‘always’ to be more consistent with other uses of same property

* support multiple keyboard dismiss modes

app/components/sidebars/main/channels_list/filtered_list/filtered_list.js

@@ -9,6 +9,7 @@ import {
     Text,
     TouchableHighlight,
     View,
+    Platform,
 } from 'react-native';
 import {injectIntl, intlShape} from 'react-intl';
 import MaterialIcon from 'react-native-vector-icons/MaterialIcons';
@@ -396,7 +397,8 @@ class FilteredList extends Component {
                     renderItem={this.renderItem}
                     keyExtractor={(item) => item.id}
                     onViewableItemsChanged={this.updateUnreadIndicators}
-                    keyboardDismissMode='on-drag'
+                    keyboardDismissMode={Platform.OS === 'ios' ? 'interactive' : 'on-drag'}
+                    keyboardShouldPersistTaps='always'
                     maxToRenderPerBatch={10}
                     viewabilityConfig={VIEWABILITY_CONFIG}
                 />