patch 8.1.2248: CTRL-W dot does not work when modifyOtherKeys is enabled

Problem:    CTRL-W dot does not work in a terminal when modifyOtherKeys is
            enabled.
Solution:   Use the modifier when needed.  Pass the modifier along with the
            key to avoid mistakes.
diff --git a/src/mouse.c b/src/mouse.c
index b71ef37..366cbaf 100644
--- a/src/mouse.c
+++ b/src/mouse.c
@@ -2012,7 +2012,7 @@
 	if (term_use_loop())
 	    // This window is a terminal window, send the mouse event there.
 	    // Set "typed" to FALSE to avoid an endless loop.
-	    send_keys_to_term(curbuf->b_term, cap->cmdchar, FALSE);
+	    send_keys_to_term(curbuf->b_term, cap->cmdchar, mod_mask, FALSE);
 	else
 # endif
 	if (mod_mask & (MOD_MASK_SHIFT | MOD_MASK_CTRL))