http: make htpstate cfg ptr const

src/app-layer-htp.c

@@ -2000,7 +2000,7 @@ static int HTPCallbackRequestLine(htp_tx_t *tx)
     HtpTxUserData *tx_ud;
     bstr *request_uri_normalized;
     HtpState *hstate = htp_connp_get_user_data(tx->connp);
-    HTPCfgRec *cfg = hstate->cfg;
+    const HTPCfgRec *cfg = hstate->cfg;
 
     request_uri_normalized = SCHTPGenerateNormalizedUri(tx, tx->parsed_uri, cfg->uri_include_all);
     if (request_uri_normalized == NULL)

src/app-layer-htp.h

@@ -252,7 +252,7 @@ typedef struct HtpState_ {
     uint64_t store_tx_id;
     FileContainer *files_ts;
     FileContainer *files_tc;
-    struct HTPCfgRec_ *cfg;
+    const struct HTPCfgRec_ *cfg;
     uint16_t flags;
     uint16_t events;
     uint16_t htp_messages_offset; /**< offset into conn->messages list */