Revert "closeOnBackpressure should block all further sending"

This reverts commit d4ffeadd88.

src/WebSocket.h

@@ -94,17 +94,11 @@ public:
             (us_socket_context_t *) us_socket_context(SSL, (us_socket_t *) this)
         );
 
-        /* If we already reached the max backpressure and started a deferred close, reject all sends */
-        if (webSocketContextData->closeOnBackpressureLimit == 2) {
-            return DROPPED;
-        }
-
         /* Skip sending and report success if we are over the limit of maxBackpressure */
         if (webSocketContextData->maxBackpressure && webSocketContextData->maxBackpressure < getBufferedAmount()) {
             /* Also defer a close if we should */
-            if (webSocketContextData->closeOnBackpressureLimit == 1) {
+            if (webSocketContextData->closeOnBackpressureLimit) {
                 us_socket_shutdown_read(SSL, (us_socket_t *) this);
-                webSocketContextData->closeOnBackpressureLimit = 2;
             }
             return DROPPED;
         }

src/WebSocketContextData.h

@@ -73,7 +73,7 @@ public:
 
     /* There needs to be a maxBackpressure which will force close everything over that limit */
     size_t maxBackpressure = 0;
-    unsigned char closeOnBackpressureLimit; /* 0, 1 (or 2 internally) */
+    bool closeOnBackpressureLimit;
     bool resetIdleTimeoutOnSend;
     bool sendPingsAutomatically;