Add username to browser named pipe on Windows

* Fixes #5393

src/browser/BrowserShared.cpp

@@ -37,7 +37,7 @@ namespace BrowserShared
                               : path + serverName;
 #elif defined(Q_OS_WIN)
         // Windows uses named pipes
-        return serverName;
+        return serverName + "_" + qgetenv("USERNAME");
 #else // Q_OS_MACOS and others
         return QStandardPaths::writableLocation(QStandardPaths::TempLocation) + serverName;
 #endif