move static variable initialization out of class definition

Signed-off-by: hultonha <hultonha@amazon.co.uk>

Code/Editor/Lib/Tests/test_ViewportManipulatorController.cpp

@@ -77,7 +77,7 @@ namespace UnitTest
     class ViewportManipulatorControllerFixture : public AllocatorsTestFixture
     {
     public:
-        static const AzFramework::ViewportId TestViewportId = AzFramework::ViewportId(0);
+        static const AzFramework::ViewportId TestViewportId;
 
         void SetUp() override
         {
@@ -108,6 +108,8 @@ namespace UnitTest
         AZStd::unique_ptr<AzToolsFramework::QtEventToAzInputMapper> m_inputChannelMapper;
     };
 
+    const AzFramework::ViewportId ViewportManipulatorControllerFixture::TestViewportId = AzFramework::ViewportId(0);
+
     TEST_F(ViewportManipulatorControllerFixture, An_event_is_not_propagated_to_the_viewport_when_a_manipulator_handles_it_first)
     {
         // forward input events to our controller list