Fix opacity issues by using a tag to apply the default opacity that can be removed

Fixes #4168

default/hypr/apps/steam.conf

@@ -1,6 +1,7 @@
 # Float Steam
 windowrule = float on, match:class steam
 windowrule = center on, match:class steam, match:title Steam
+windowrule = tag -default-opacity, match:class steam.*
 windowrule = opacity 1 1, match:class steam.*
 windowrule = size 1100 700, match:class steam, match:title Steam
 windowrule = size 460 800, match:class steam, match:title Friends List