Remove known issue about crash with enterprise buttons

Can't repro this anymore.

Change-Id: I74cb730d18105bec6d6e86c3be3f1c5eb7352ded
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>
Reviewed-by: Pasi Keränen <pasi.keranen@digia.com>

README

@@ -75,8 +75,6 @@ Known Issues
 - QObject based TypedArray implementation is a temporary stop gap solution
   and will be removed from QtCanvas3D later on.
 - Texturing does not work perfectly in all of the examples.
-- Using Qt Quick Enterprise Controls buttons cause a crash on application exit
-  on Windows in certain circumstances (try JSON Models Example for reference).
 - Resizing window works incorrectly if viewport is updated during rendering to match
   the window size (try Framebuffer Example for reference).
 - These methods are named for Tech Preview with “a” postfix to denote “array” versions taking a JavaScript array instead of TypedArray.

src/doc/src/qtcanvas3d.qdoc

@@ -170,8 +170,6 @@
     \list
         \li QObject based TypedArray implementation is a temporary stop gap solution and will be removed from QtCanvas3D later on.
         \li Texturing does not work perfectly in all of the examples.
-        \li Using Qt Quick Enterprise Controls buttons cause a crash on application exit
-            on Windows in certain circumstances (try \l{JSON Models Example} for reference).
         \li Resizing window works incorrectly if viewport is updated during rendering to match
             the window size (try \l{Framebuffer Example} for reference).
         \li These methods are named for Tech Preview with “a” postfix to denote “array” versions taking a JavaScript array instead of TypedArray.