Fix TSA warnings in Clang 15 (fixes #5548)

src/engine/client/serverbrowser_http.cpp:147:1: warning: mutex 'ls.m_Lock' is still held at the end of function [-Wthread-safety-analysis]
}
^

src/base/lock_scope.h

@@ -6,7 +6,7 @@
 class SCOPED_CAPABILITY CLockScope
 {
 public:
-	CLockScope(LOCK Lock) ACQUIRE(Lock, m_Lock) REQUIRES(!Lock, !m_Lock) :
+	CLockScope(LOCK Lock) ACQUIRE(Lock, m_Lock) :
 		m_Lock(Lock)
 	{
 		lock_wait(m_Lock);