patch 8.0.0721: :argedit can only have one argument

Problem:    :argedit can only have one argument.
Solution:   Allow for multiple arguments. (Christian Brabandt)
diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index 0844a9c..dd54981 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -137,7 +137,7 @@
 			BANG|NEEDARG|EXTRA|NOTRLCOM|RANGE|NOTADR|DFLALL,
 			ADDR_ARGUMENTS),
 EX(CMD_argedit,		"argedit",	ex_argedit,
-			BANG|NEEDARG|RANGE|NOTADR|ZEROR|FILE1|EDITCMD|ARGOPT|TRLBAR,
+			BANG|NEEDARG|RANGE|NOTADR|ZEROR|FILES|EDITCMD|ARGOPT|TRLBAR,
 			ADDR_ARGUMENTS),
 EX(CMD_argglobal,	"argglobal",	ex_args,
 			BANG|FILES|EDITCMD|ARGOPT|TRLBAR,