scope_exit: Make constexpr

Allows the use of the macro in constexpr-contexts.
Also avoids some potential problems when nesting braces inside it.

src/yuzu_cmd/yuzu.cpp

@@ -327,7 +327,9 @@ int main(int argc, char** argv) {
 #endif
 
     MicroProfileOnThreadCreate("EmuThread");
-    SCOPE_EXIT({ MicroProfileShutdown(); });
+    SCOPE_EXIT {
+        MicroProfileShutdown();
+    };
 
     Common::ConfigureNvidiaEnvironmentFlags();