Add missing break for LED state check

The previous code would incorrectly also add support for QEMU
key events if LED state was supported.
diff --git a/common/rfb/ConnParams.cxx b/common/rfb/ConnParams.cxx
index 23f02ed..80b4a5a 100644
--- a/common/rfb/ConnParams.cxx
+++ b/common/rfb/ConnParams.cxx
@@ -147,6 +147,7 @@
       break;
     case pseudoEncodingLEDState:
       supportsLEDState = true;
+      break;
     case pseudoEncodingQEMUKeyEvent:
       supportsQEMUKeyEvent = true;
       break;