Reset logical switch v2 range if v1 changes (PR #383)

* Reset logical switch v2 range if v1 changes
Use the v1 handler to update v2 range if the v2 source box has already
been created, so that the min/max values are updated from the default.

* Move invalidate, add bounds checking for v2 range

* Out of range check doesn't need to be inclusive

* Remove range check as is inconsistent with buggy B&W behaviour

radio/src/gui/colorlcd/model_logical_switches.cpp

@@ -161,7 +161,14 @@ class LogicalSwitchEditPage: public Page
                          [=](int32_t newValue) {
                            cs->v1 = newValue;
                            SET_DIRTY();
-                           v2Edit->invalidate();
+                           if (v2Edit != nullptr)
+                           {
+                             int16_t v2_min = 0, v2_max = 0;
+                             getMixSrcRange(cs->v1, v2_min, v2_max);
+                             v2Edit->setMin(v2_min);
+                             v2Edit->setMax(v2_max);
+                             v2Edit->invalidate();
+                           }
                          });
         grid.nextLine();