patch 8.0.0910: cannot create a terminal in the current window

Problem:    Cannot create a terminal in the current window.
Solution:   Add option "curwin" and ++curwin.
diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index 977b01a..6fb528d 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -1484,7 +1484,7 @@
 			NEEDARG|EXTRA|TRLBAR|NOTRLCOM|CMDWIN,
 			ADDR_LINES),
 EX(CMD_terminal,	"terminal",	ex_terminal,
-			RANGE|NOTADR|FILES|TRLBAR|CMDWIN,
+			RANGE|NOTADR|BANG|FILES|TRLBAR|CMDWIN,
 			ADDR_OTHER),
 EX(CMD_tfirst,		"tfirst",	ex_tag,
 			RANGE|NOTADR|BANG|TRLBAR|ZEROR,