gh: Remove @wythe from the codeowners

For some reason Github complains that @wythe doesn't have access to
the public repository, removing in order to silence that warning. Feel
free to contact me to investigate what's happening and re-enable :-)

Changelog-None

.github/CODEOWNERS

@@ -11,10 +11,5 @@ wallet/invoices.*       @ZmnSCPxj
 plugins/multifundchannel.c @ZmnSCPxj
 doc/BACKUP.md           @ZmnSCPxj @cdecker
 
-common/param.*          @wythe
-common/json.*           @wythe
-common/json_tok.*       @wythe
-common/wallet_tx.*      @wythe
-
 # See https://help.github.com/articles/about-codeowners/ for more
 # information