msdk: h265dec: remove framerate field from sink caps template

Removes unessential field framerate for decoder so that negotiation
works even if framerate is not provided from upstream.

https://bugzilla.gnome.org/show_bug.cgi?id=789752
diff --git a/sys/msdk/gstmsdkh265dec.c b/sys/msdk/gstmsdkh265dec.c
index e593a74..f89cf0a 100644
--- a/sys/msdk/gstmsdkh265dec.c
+++ b/sys/msdk/gstmsdkh265dec.c
@@ -48,7 +48,6 @@
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("video/x-h265, "
-        "framerate = (fraction) [0/1, MAX], "
         "width = (int) [ 1, MAX ], height = (int) [ 1, MAX ], "
         "stream-format = (string) byte-stream , alignment = (string) au , "
         "profile = (string) main ")