x0vncserver: Make sure rotation for new outputs is set to RR_Rotate_0

The Xserver (at least Xorg 1.19) rejects RRSetCrtcConfig requests if
rotation is zero.
diff --git a/unix/x0vncserver/RandrGlue.c b/unix/x0vncserver/RandrGlue.c
index 2e47763..ff12902 100644
--- a/unix/x0vncserver/RandrGlue.c
+++ b/unix/x0vncserver/RandrGlue.c
@@ -468,6 +468,7 @@
       }
 
       crtcid = output->crtcs[i];
+      crtc->rotation = RR_Rotate_0;
       break;
     }
   } else {