Point back to a master tag of mosart

I'm not ready to bring the mosart branch in, and it's not needed yet
because we're not yet running LILAC with MOSART. I have opened a PR for
it to bring in later: ESCOMP/MOSART#32

Author: billsacks

Externals.cfg

@@ -23,7 +23,7 @@ required = True
 local_path = components/mosart
 protocol = git
 repo_url = https://github.com/ESCOMP/MOSART
-hash = a108912c6b2fb2294abbfb720ad151cde76f9845
+tag = mosart1_0_36
 required = True
 
 [cime]