Merge client resize capabilities

No need to have one setting for each extension. All the client code
needs to indicate is if it supports resize. The common code can then
map this to relevant extensions.
diff --git a/common/rfb/ServerParams.cxx b/common/rfb/ServerParams.cxx
index 9ae8a60..289c864 100644
--- a/common/rfb/ServerParams.cxx
+++ b/common/rfb/ServerParams.cxx
@@ -26,7 +26,7 @@
 ServerParams::ServerParams()
   : majorVersion(0), minorVersion(0),
     supportsLocalCursor(false),
-    supportsDesktopResize(false), supportsExtendedDesktopSize(false),
+    supportsDesktopResize(false),
     supportsLEDState(false), supportsQEMUKeyEvent(false),
     supportsSetDesktopSize(false), supportsFence(false),
     supportsContinuousUpdates(false),