patch 9.0.0595: extra newline in messages after a verbose shell message

Problem:    Extra newline in messages after a verbose shell message.
Solution:   Output the newline with msg_putchar_attr(). (closes #11233)
            Make it possible to filter a screendump before comparing it.
diff --git a/src/misc2.c b/src/misc2.c
index 8419402..5d36cc1 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -1795,7 +1795,7 @@
     {
 	verbose_enter();
 	smsg(_("Calling shell to execute: \"%s\""), cmd == NULL ? p_sh : cmd);
-	out_char('\n');
+	msg_putchar_attr('\n', 0);
 	cursor_on();
 	verbose_leave();
     }