lavc/hevcdec: drop unused HEVCContext.width/height

libavcodec/hevc/hevcdec.h

@@ -456,9 +456,6 @@ typedef struct HEVCContext {
     uint8_t             threads_type;
     uint8_t             threads_number;
 
-    int                 width;
-    int                 height;
-
     /** 1 if the independent slice segment header was successfully parsed */
     uint8_t slice_initialized;