patch 8.0.1804: using :normal in terminal window causes problems

Problem:    Using :normal in terminal window causes problems. (Dominique
            Pelle)
Solution:   Don't call terminal_loop() for :normal. (closes #2886)
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 259edb8..ea5ff8a 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -3313,7 +3313,7 @@
 
 		if (!dangerous)
 		    ++ex_normal_busy;
-		exec_normal(TRUE);
+		exec_normal(TRUE, TRUE);
 		if (!dangerous)
 		    --ex_normal_busy;