JVMCBC-1702 PipelineErrorHandler.channelInactive fires wrong event

Motivation
----------
Should fire "channel inactive" instead of "channel active".

Currently, this doesn't matter since it's the last handler
in the pipeline, but let's fix it anyway in case another
handler is added in the future.

Change-Id: I0fe87adcff4edd0734df77d86767554950d89c3e
Reviewed-on: https://review.couchbase.org/c/couchbase-jvm-clients/+/235873
Tested-by: Build Bot <build@couchbase.com>
Reviewed-by: Michael Reiche <michael.reiche@couchbase.com>

Author: dnault

core-io/src/main/java/com/couchbase/client/core/io/netty/PipelineErrorHandler.java

@@ -78,7 +78,7 @@ public void exceptionCaught(final ChannelHandlerContext ctx, final Throwable cau
   @Override
   public void channelInactive(ChannelHandlerContext ctx) {
     endpoint.notifyChannelInactive();
-    ctx.fireChannelActive();
+    ctx.fireChannelInactive();
   }
 
   /**