update: make wechat float

hypr/conf/windowrules/custom.conf

@@ -18,5 +18,6 @@ windowrule = float,title=^(Mathematica)$
 windowrule = opacity 0.75, ^(Code)$
 windowrule = opacity 0.75, ^(code-url-handler)$
 windowrule = float,^(QQ)$
+windowrule = float,^(wechat)$
 windowrule = float,^(fdm)$
 windowrule = float,^(xdg-desktop-portal-gtk)$