Fix transform skip for inter

The transform skip flag in cu_info_t was stored under the intra
substruct even though transform skip can be used for inter as well. This
caused bitstream errors. Fixed by moving the flag out of the substruct.

src/cu.h

@@ -123,6 +123,7 @@ typedef struct
   uint8_t skipped   : 1; //!< \brief flag to indicate this block is skipped
   uint8_t merged    : 1; //!< \brief flag to indicate this block is merged
   uint8_t merge_idx : 3; //!< \brief merge index
+  uint8_t tr_skip   : 1; //!< \brief transform skip flag
 
   uint16_t cbf;
 
@@ -137,7 +138,6 @@ typedef struct
     struct {
       int8_t mode;
       int8_t mode_chroma;
-      int8_t tr_skip;    //!< \brief transform skip flag
 #if KVZ_SEL_ENCRYPTION
       int8_t mode_encry;
 #endif

src/encode_coding_tree.c

@@ -372,7 +372,7 @@ static void encode_transform_unit(encoder_state_t * const state,
                          width,
                          0,
                          scan_idx,
-                         cur_pu->intra.tr_skip);
+                         cur_pu->tr_skip);
   }
 
   if (depth == MAX_DEPTH + 1) {

src/transform.c

@@ -369,19 +369,22 @@ static void quantize_tr_residual(encoder_state_t * const state,
     }
 
   } else if (can_use_trskip) {
+    int8_t tr_skip = 0;
+
     // Try quantization with trskip and use it if it's better.
     has_coeffs = kvz_quantize_residual_trskip(state,
                                               cur_pu,
                                               tr_width,
                                               color,
                                               scan_idx,
-                                              &cur_pu->intra.tr_skip,
+                                              &tr_skip,
                                               lcu_width,
                                               lcu_width,
                                               ref,
                                               pred,
                                               pred,
                                               coeff);
+    cur_pu->tr_skip = tr_skip;
   } else {
     has_coeffs = kvz_quantize_residual(state,
                                        cur_pu,