patch 8.1.1248: no test for dec mouse

Problem:    No test for dec mouse.
Solution:   Add some tests for dec mouse.  Add "no_query_mouse".
diff --git a/src/evalfunc.c b/src/evalfunc.c
index e65ab94..2b1b142 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -14302,12 +14302,15 @@
 	}
 	else if (STRCMP(name, (char_u *)"nfa_fail") == 0)
 	    nfa_fail_for_testing = val;
+	else if (STRCMP(name, (char_u *)"no_query_mouse") == 0)
+	    no_query_mouse_for_testing = val;
 	else if (STRCMP(name, (char_u *)"ALL") == 0)
 	{
 	    disable_char_avail_for_testing = FALSE;
 	    disable_redraw_for_testing = FALSE;
 	    ignore_redraw_flag_for_testing = FALSE;
 	    nfa_fail_for_testing = FALSE;
+	    no_query_mouse_for_testing = FALSE;
 	    if (save_starting >= 0)
 	    {
 		starting = save_starting;