remove BTM_WBS_INCLUDED for bta_hf_client_version select

components/bt/host/bluedroid/bta/hf_client/bta_hf_client_main.c

@@ -232,11 +232,7 @@ const tBTA_HF_CLIENT_ST_TBL bta_hf_client_st_tbl[] = {
     bta_hf_client_st_closing
 };
 
-#if BTM_WBS_INCLUDED
 const char *bta_hf_client_version = "1.6";
-#else
-const char *bta_hf_client_version = "1.5";
-#endif
 
 /* HF Client control block */
 #if BTA_DYNAMIC_MEMORY == FALSE