added mods status bit to visualizer.

Since we can't read the real_mods and oneshot_mods static variable
directly within the update_user_visualizer_state
function (Threading and serial link). We are know storing the mods
states in the visualizer_keyboard_status_t structure. We can now
display the status of the modifier keys on the LCD display.

tmk_core/common/keyboard.c

@@ -188,7 +188,7 @@ MATRIX_LOOP_END:
 #endif
 
 #ifdef VISUALIZER_ENABLE
-    visualizer_update(default_layer_state, layer_state, host_keyboard_leds());
+    visualizer_update(default_layer_state, layer_state, visualizer_get_mods(), host_keyboard_leds());
 #endif
 
     // update LED