For today, list the upcoming events that END after the current time, instead
of listing the events that START after it.
This also makes today's all-day events be displayed.

--- a/src/menu.cpp
+++ b/src/menu.cpp
@@ -158,7 +158,7 @@
 
         std::vector<Appointment> upcoming;
         for(const auto& a : m_state->calendar_upcoming->appointments().get())
-            if (begin <= a.begin)
+            if (begin < a.end)
                 upcoming.push_back(a);
  
         if (m_upcoming != upcoming)