Remove misc-fixes flag from the experimental list

This flag is not in effect in the codebase. The related contents
have been merged.

Change-Id: I7125ccbedf39e4683d117ecb72ffdd7547c23fc4

configure

@@ -275,7 +275,6 @@ EXPERIMENT_LIST="
     ref_mv
     dual_filter
     ext_tx
-    misc_fixes
     ext_intra
     ext_inter
     ext_interp