panels: Adjust opacity value for the exit widget.
panels: Adjust opacity value for the exit widget.

This makes this icon less invisible.

Once the user hovers over the "x" it will become brighter to notify the user.
rht/zulip,eeshangarg/zulip,rht/zulip,hackerkid/zulip,zulip/zulip,zulip/zulip,rht/zulip,zulip/zulip,andersk/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,eeshangarg/zulip,punchagan/zulip,punchagan/zulip,andersk/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,hackerkid/zulip,punchagan/zulip,kou/zulip,hackerkid/zulip,andersk/zulip,hackerkid/zulip,punchagan/zulip,kou/zulip,andersk/zulip,andersk/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,rht/zulip,hackerkid/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,kou/zulip,kou/zulip,rht/zulip,hackerkid/zulip,punchagan/zulip,kou/zulip,zulip/zulip,punchagan/zulip,zulip/zulip,eeshangarg/zulip,eeshangarg/zulip