Fix regression of client offloadNone() strategy

Motivation:
The changes in apple#2108 introduced a regression in the handling of
computation of the effective strategy of a client when a
strategy `offloadNone()` (or the deprecated `offloadNever()`) was used
with the  `HttpClientBuilder`. Rather than preventing all offloading,
the computed offloading was used.
Modifications:
If the strategy specified on the `HttpClientBuilder` does not specify
any offloads then no offloading will be used.
Result:
The offloading behavior matches the requested behavior specified on
the  `HttpClientBuilder`.

servicetalk-http-netty/src/main/java/io/servicetalk/http/netty/ClientStrategyInfluencerChainBuilder.java

@@ -126,7 +126,7 @@ void add(StreamingHttpConnectionFilterFactory connectionFilter) {
         }
     }
 
-    HttpExecutionStrategy buildForClient(HttpExecutionStrategy transportStrategy) {
+    HttpExecutionStrategy buildForClient(HttpExecutionStrategy builderStrategy) {
         HttpExecutionStrategy chainStrategy = clientChain;
         if (null != connFilterChain) {
             chainStrategy = null != chainStrategy ? chainStrategy.merge(connFilterChain) : connFilterChain;
@@ -138,9 +138,10 @@ HttpExecutionStrategy buildForClient(HttpExecutionStrategy transportStrategy) {
         }
 
         return (null == chainStrategy || !chainStrategy.hasOffloads()) ?
-                transportStrategy :
-                defaultStrategy() == transportStrategy || !transportStrategy.hasOffloads() ?
-                        chainStrategy : chainStrategy.merge(transportStrategy);
+                builderStrategy :
+                defaultStrategy() == builderStrategy ?
+                        chainStrategy : builderStrategy.hasOffloads() ?
+                            chainStrategy.merge(builderStrategy) : builderStrategy;
     }
 
     ExecutionStrategy buildForConnectionFactory() {