hide keyboard when navigating

closes #227

mastodon/src/main/java/org/joinmastodon/android/fragments/ComposeFragment.java

@@ -621,6 +621,7 @@ public class ComposeFragment extends MastodonToolbarFragment implements OnBackPr
 				Bundle args=new Bundle();
 				args.putString("account", accountID);
 				args.putParcelable("profileAccount", Parcels.wrap(replyTo.account));
+				imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
 				Nav.go(getActivity(), ProfileFragment.class, args);
 			});