Fixed issue with groups timeline composer sticking to group when leaving page

• Fixed:
- issue with groups timeline composer sticking to group when leaving page

app/javascript/gabsocial/pages/group_page.js

@@ -5,6 +5,7 @@ import { defineMessages, injectIntl } from 'react-intl'
 import ImmutablePropTypes from 'react-immutable-proptypes'
 import ImmutablePureComponent from 'react-immutable-pure-component'
 import { fetchGroup } from '../actions/groups'
+import { changeComposeGroupId } from '../actions/compose'
 import PageTitle from '../features/ui/util/page_title'
 import GroupLayout from '../layouts/group_layout'
 import TimelineComposeBlock from '../components/timeline_compose_block'
@@ -18,6 +19,11 @@ class GroupPage extends ImmutablePureComponent {
 		this.props.dispatch(fetchGroup(this.props.params.id))
 	}
 
+	componentWillUnmount() {
+		//Reset group composer
+		this.props.dispatch(changeComposeGroupId(null))
+	}
+
 	render() {
 		const {
 			intl,