[FIX] Create discussion modal - cancel button and invite users alignment (#22718)

Co-authored-by: gabriellsh <40830821+gabriellsh@users.noreply.github.com>

client/components/CreateDiscussion/CreateDiscussion.tsx

@@ -139,7 +139,7 @@ const CreateDiscussion = ({
 					</Field>
 					<Field>
 						<Field.Label>{t('Invite_Users')}</Field.Label>
-						<Field.Row>
+						<Field.Row w='full' display='flex' flexDirection='column' alignItems='stretch'>
 							<UserAutoCompleteMultiple
 								value={usernames}
 								onChange={onChangeUsers}
@@ -168,6 +168,7 @@ const CreateDiscussion = ({
 			</Modal.Content>
 			<Modal.Footer>
 				<ButtonGroup align='end'>
+					<Button onClick={onClose}>{t('Cancel')}</Button>
 					<Button primary disabled={!canCreate} onClick={create}>
 						{t('Create')}
 					</Button>