Fix bug 595517 - Custom reminder not updated if length text is selected before changing. r=philipp

--HG--
extra : rebase_source : 06c88f426d47548846585598c3923c2d19074709

calendar/base/content/dialogs/calendar-event-dialog-reminder.xul

@@ -94,7 +94,7 @@
                    type="number"
                    size="1"
                    min="0"
-                   oninput="updateReminder(event)"/>
+                   onkeyup="updateReminder(event)"/>
           <menulist id="reminder-unit" oncommand="updateReminder(event)" flex="1">
             <menupopup id="reminder-unit-menupopup">
               <menuitem id="reminder-minutes-menuitem"