patch 8.0.1108: cannot specify mappings for the terminal window

Problem:    Cannot specify mappings for the terminal window.
Solution:   Add the :tmap command and associated code.  (Jacob Askeland,
            closes #2073)
diff --git a/src/main.c b/src/main.c
index 5840085..e2c04f6 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1363,7 +1363,7 @@
 		/* If terminal_loop() returns OK we got a key that is handled
 		 * in Normal model.  With FAIL we first need to position the
 		 * cursor and the screen needs to be redrawn. */
-		if (terminal_loop() == OK)
+		if (terminal_loop(TRUE) == OK)
 		    normal_cmd(&oa, TRUE);
 	    }
 	    else