Rename "Pressing return on an avatar attachment" inventory setting

[AtlasLinden]

Environment

Maint C 7.1.12.12258017789

Description

The new inventory setting "Pressing return on an avatar attachment" may be confusing to some users as there already exists a return option in the viewer.
Rename this to something more clear.

Suggestions:

• "Double clicking..."
• "Pressing Enter" (although mac keyboards state Return)
• "Preferred avatar attachment action"
• "Attachment action preference"
• "Double click / enter behaviour"

Reproduction steps

Observe inventory settings

[AtlasLinden]

Steeltoe has suggested to have this changed to "Pressing enter"

[AtlasLinden]

Moved to 2025.05 to be included with Maint C integration

[Dan-Linden]

Passed QA.
Verified on Second Life Release 7.1.15.15309219046 on Win11/OSX in the scope of https://github.com/secondlife/iqa/issues/500