[Fix] (MG_State/Framebuffer): properly bump FBO version

MobileGL/MG_State/GLState/FramebufferState/FramebufferObject.cpp

@@ -143,7 +143,7 @@ namespace MobileGL {
             void FramebufferObject::SetDrawBuffer(Uint index, FramebufferAttachmentType buffer) {
                 if (m_drawBuffers[index] == buffer) return;
                 m_drawBuffers[index] = buffer;
-                ++m_attachmentVersions[static_cast<SizeT>(buffer)];
+                BumpAttachmentVersion(buffer);
             }
 
             const FramebufferObject::FramebufferAttachmentArray& FramebufferObject::GetDrawBuffers() const {

MobileGL/MG_State/GLState/FramebufferState/FramebufferObject.h

@@ -128,7 +128,6 @@ namespace MobileGL {
 
             private:
                 void BumpAttachmentVersion(FramebufferAttachmentType type);
-                void BumpBufferAttachVersion();
 
                 const Uint m_externalIndex = 0;
                 FramebufferAttachmentObjectArray m_attachmentObjects;