fix: Guard SetEntityDrawOutline behind a DoesEntityExist check

[Gogsi]

Description

In FiveM for GTAV Enhanced, calling SetEntityDrawOutline on an invalid entity throws an error and ends execution of the function, breaking the decoration customization.

Related Issues

Type of Change

• Bug fix
• New feature
• Refactor
• Breaking change

Testing

Tested on FiveM for GTAV Enhanced build 153. Before adding a new object threw this error in the console, after the change it's gone

[27-09-2026 00:12:07] [ warning] [                ] Unable to execute Native SetEntityDrawOutline: "No entity was found for ID 0."
^3> SetEntityDrawOutline^5
^3> ToggleDecorating^5 (qbx_properties/client/decorating.lua:106)
^3> func^5 (qbx_properties/client/property.lua:144)
^3> [global chunk]^5 (scheduler.lua:363)
^3> pcall^5
^3> [global chunk]^5 (scheduler.lua:362)

Checklist

• I tested this on a local Qbox server
• My PR title follows Conventional Commits
• My changes follow the contribution guidelines
• I fixed any lint issues reported by CI