patch 8.0.0872: no mouse scroll with a terminal window

Problem:    Using mouse scroll while a terminal window has focus and the mouse
            pointer is on another window does not work.  Same for focus in a
            non-terminal window ahd the mouse pointer is over a terminal
            window.
Solution:   Send the scroll action to the right window.
diff --git a/src/normal.c b/src/normal.c
index 16f9f0e..25ab2d3 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -4638,6 +4638,11 @@
 
     if (cap->arg == MSCR_UP || cap->arg == MSCR_DOWN)
     {
+# ifdef FEAT_TERMINAL
+	if (term_use_loop())
+	    send_keys_to_term(curbuf->b_term, cap->cmdchar, TRUE);
+	else
+# endif
 	if (mod_mask & (MOD_MASK_SHIFT | MOD_MASK_CTRL))
 	{
 	    (void)onepage(cap->arg ? FORWARD : BACKWARD, 1L);