opt: removed static prices

after testing, it's actually always better to use dynamic prices
albeit initialised from dictionary.

lib/compress/zstd_compress_internal.h

@@ -76,7 +76,7 @@ typedef struct {
     U32 rep[ZSTD_REP_NUM];
 } ZSTD_optimal_t;
 
-typedef enum { zop_dynamic=0, zop_predef, zop_static } ZSTD_OptPrice_e;
+typedef enum { zop_dynamic=0, zop_predef } ZSTD_OptPrice_e;
 
 typedef struct {
     /* All tables are allocated inside cctx->workspace by ZSTD_resetCCtx_internal() */