fix(ui): const correctness for CSimpleCamera::FOV

src/ui/simple/CSimpleCamera.cpp

@@ -64,7 +64,7 @@ CSimpleCamera::CSimpleCamera(float nearZ, float farZ, float fov) {
     this->SetFacing(0.0f, 0.0f, 0.0f);
 }
 
-float CSimpleCamera::FOV() {
+float CSimpleCamera::FOV() const {
     return this->m_fov;
 }
 

src/ui/simple/CSimpleCamera.hpp

@@ -10,7 +10,7 @@ class CM2Scene;
 class CSimpleCamera {
     public:
         // Virtual public member functions
-        virtual float FOV();
+        virtual float FOV() const;
         virtual C3Vector Forward() const;
         virtual C3Vector Right() const;
         virtual C3Vector Up() const;