Correct a couple more invite shortlinks to use HTTPS

Closes #5511
// FREEBIE

res/layout/invite_activity.xml

@@ -39,7 +39,7 @@
                       android:layout_width="match_parent"
                       android:layout_height="wrap_content"
                       android:minLines="2"
-                      tools:text="Let's switch to Signal: http://sgnl.link/asdfdfsa"
+                      tools:text="Let's switch to Signal: https://sgnl.link/asdfdfsa"
                       android:background="@drawable/sent_bubble"
                       android:paddingTop="10dp"
                       android:paddingBottom="10dp"

src/org/thoughtcrime/securesms/InviteActivity.java

@@ -83,7 +83,7 @@ public class InviteActivity extends PassphraseRequiredActionBarActivity implemen
     heart             = ViewUtil.findById(this, R.id.heart);
     contactsFragment  = (ContactSelectionListFragment)getSupportFragmentManager().findFragmentById(R.id.contact_selection_list_fragment);
 
-    inviteText.setText(getString(R.string.InviteActivity_lets_switch_to_signal, "http://sgnl.link/1KpeYmF"));
+    inviteText.setText(getString(R.string.InviteActivity_lets_switch_to_signal, "https://sgnl.link/1KpeYmF"));
     updateSmsButtonText();
 
     if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {