patch 7.4.1696

Problem:    When using :stopinsert in a silent mapping the "INSERT" message
            isn't cleared. (Coacher)
Solution:   Always clear the message. (Christian Brabandt, closes #718)

src/ex_docmd.c

@@ -10040,6 +10040,7 @@ ex_stopinsert(exarg_T *eap UNUSED)
 {
     restart_edit = 0;
     stop_insert_mode = TRUE;
+    clearmode();
 }
 
 /*