FifoDataFile: In-class initialize member variables where applicable

Source/Core/Core/FifoPlayer/FifoDataFile.h

@@ -94,8 +94,8 @@ private:
   u32 m_XFRegs[XF_REGS_SIZE];
   u8 m_TexMem[TEX_MEM_SIZE];
 
-  u32 m_Flags;
-  u32 m_Version;
+  u32 m_Flags = 0;
+  u32 m_Version = 0;
 
   std::vector<FifoFrameInfo> m_Frames;
 };