Enable/disable upload/send button correctly.

Passes an 'index' magic number to the upload/save functions which
pass that back to the *Done callbacks, so we know if the *raw*
snapshot is still up to date when the upload succeeds or fails.

indra/newview/llviewermenufile.cpp

@@ -574,7 +574,7 @@ class LLFileTakeSnapshotToDisk : public view_listener_t
 			formatted->enableOverSize() ;
 			formatted->encode(raw, 0);
 			formatted->disableOverSize();
-			gViewerWindow->saveImageNumbered(formatted);
+			gViewerWindow->saveImageNumbered(formatted, -1);
 		}
 		return true;
 	}