We don't want submit buttons (#29747)

Otherwise this will submit the form.

src/components/views/rooms/MemberList/MemberListHeaderView.tsx

@@ -52,6 +52,7 @@ const InviteButton: React.FC<Props> = ({ vm }) => {
                     Icon={InviteIcon}
                     disabled={disabled}
                     aria-label={_t("action|invite")}
+                    type="button"
                 />
             </OptionalTooltip>
         );
@@ -67,6 +68,7 @@ const InviteButton: React.FC<Props> = ({ vm }) => {
                 className="mx_MemberListHeaderView_invite_large"
                 disabled={!vm.canInvite}
                 onClick={vm.onInviteButtonClick}
+                type="button"
             >
                 {_t("action|invite")}
             </Button>