RTCClient.setLoggedIn: Use parameter to set field

So far, RTCClient.setLoggedIn was always setting the loggedIn field to
false regardless of the parameter it was passed.

Use the parameter to set the loggedIn field.

Change-Id: I9911ef7c52fd3b9102a7a0baffe60078cdfe34fc
diff --git a/src/main/java/com/googlesource/gerrit/plugins/its/rtc/network/RTCClient.java b/src/main/java/com/googlesource/gerrit/plugins/its/rtc/network/RTCClient.java
index 0d7ad35..3dc52ce 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/its/rtc/network/RTCClient.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/its/rtc/network/RTCClient.java
@@ -230,6 +230,6 @@
   }
 
   public void setLoggedIn(boolean b) {
-    loggedIn = false;
+    loggedIn = b;
   }
 }