obs-browser: Update version to 2.18.5

71ef41a - Null check macOS window handle before detaching view
6235dfd - cmake: Remove setting code sign identity for Xcode builds

plugins/obs-browser

@@ -1 +1 @@
-Subproject commit 8e8511a07bf4a2a4ebae4e5de023ec033cc19f8f
+Subproject commit 453904afc2b40089d0914f2a15e38a5519358021