Remove unused flags from ServerParams

These were either completely unused, or always true.
diff --git a/common/rfb/ServerParams.cxx b/common/rfb/ServerParams.cxx
index 4ee25a8..9ae8a60 100644
--- a/common/rfb/ServerParams.cxx
+++ b/common/rfb/ServerParams.cxx
@@ -25,11 +25,8 @@
 
 ServerParams::ServerParams()
   : majorVersion(0), minorVersion(0),
-    useCopyRect(false),
-    supportsLocalCursor(false), supportsLocalXCursor(false),
-    supportsLocalCursorWithAlpha(false),
+    supportsLocalCursor(false),
     supportsDesktopResize(false), supportsExtendedDesktopSize(false),
-    supportsDesktopRename(false), supportsLastRect(false),
     supportsLEDState(false), supportsQEMUKeyEvent(false),
     supportsSetDesktopSize(false), supportsFence(false),
     supportsContinuousUpdates(false),