Composer: Remove preselectDate

This value is only used to track when a reply happens. On soapbox-fe, a reply causes a new ComposeForm to mount, so we can track it that way instead.

app/gabsocial/features/compose/components/compose_form.js

@@ -51,7 +51,6 @@ class ComposeForm extends ImmutablePureComponent {
     spoilerText: PropTypes.string,
     focusDate: PropTypes.instanceOf(Date),
     caretPosition: PropTypes.number,
-    preselectDate: PropTypes.instanceOf(Date),
     isSubmitting: PropTypes.bool,
     isChangingUpload: PropTypes.bool,
     isUploading: PropTypes.bool,

app/gabsocial/features/compose/containers/compose_form_container.js

@@ -19,7 +19,6 @@ const mapStateToProps = state => ({
   privacy: state.getIn(['compose', 'privacy']),
   focusDate: state.getIn(['compose', 'focusDate']),
   caretPosition: state.getIn(['compose', 'caretPosition']),
-  preselectDate: state.getIn(['compose', 'preselectDate']),
   isSubmitting: state.getIn(['compose', 'is_submitting']),
   isChangingUpload: state.getIn(['compose', 'is_changing_upload']),
   isUploading: state.getIn(['compose', 'is_uploading']),

app/gabsocial/reducers/compose.js

@@ -54,7 +54,6 @@ const initialState = ImmutableMap({
   text: '',
   focusDate: null,
   caretPosition: null,
-  preselectDate: null,
   in_reply_to: null,
   is_composing: false,
   is_submitting: false,
@@ -247,7 +246,6 @@ export default function compose(state = initialState, action) {
       map.set('privacy', privacyPreference(action.status.get('visibility'), state.get('default_privacy')));
       map.set('focusDate', new Date());
       map.set('caretPosition', null);
-      map.set('preselectDate', new Date());
       map.set('idempotencyKey', uuid());
 
       if (action.status.get('spoiler_text').length > 0) {