PHPLIB-473: Don't override readConcern when in a transaction

Author: alcaeus

src/Client.php

@@ -313,7 +313,7 @@ public function watch(array $pipeline = [], array $options = [])
 
         $server = select_server($this->manager, $options);
 
-        if (! isset($options['readConcern']) && server_supports_feature($server, self::$wireVersionForReadConcern)) {
+        if (! isset($options['readConcern']) && server_supports_feature($server, self::$wireVersionForReadConcern) && ! is_in_transaction($options)) {
             $options['readConcern'] = $this->readConcern;
         }
 

src/Database.php

@@ -511,7 +511,7 @@ public function watch(array $pipeline = [], array $options = [])
 
         $server = select_server($this->manager, $options);
 
-        if (! isset($options['readConcern']) && server_supports_feature($server, self::$wireVersionForReadConcern)) {
+        if (! isset($options['readConcern']) && server_supports_feature($server, self::$wireVersionForReadConcern) && ! is_in_transaction($options)) {
             $options['readConcern'] = $this->readConcern;
         }