Add real item check on set_turn_to_ice

[M60TM]

• Add exclusion when someone cause damage through env_explosion or world.

L 11/28/2023 - 19:19:50: [SM] Exception reported: World not allowed
L 11/28/2023 - 19:19:50: [SM] Blaming: tf2attributes.smx
L 11/28/2023 - 19:19:50: [SM] Call stack trace:
L 11/28/2023 - 19:19:50: [SM]   [0] SDKCall
L 11/28/2023 - 19:19:50: [SM]   [1] Line 911, /scratch/scripting/tf2attributes.sp::Native_HookValueInt
L 11/28/2023 - 19:19:50: [SM]   [3] TF2Attrib_HookValueInt
L 11/28/2023 - 19:19:50: [SM]   [4] Line 1114, C:\suspawn\mystuff_7040\scripting\tf2attribute_support.sp::OnPlayerKilledPre
L 11/28/2023 - 19:19:50: [SM]   [6] SDKHooks_TakeDamage
L 11/28/2023 - 19:19:50: [SM]   [7] Line 428, C:\suspawn\mystuff_7040\scripting\joke_medigun_mod_drain_health.sp::MedicDetonate
L 11/28/2023 - 19:19:50: [SM]   [8] Line 395, C:\suspawn\mystuff_7040\scripting\joke_medigun_mod_drain_health.sp::OnMedigunSecondaryAttackPre

[nosoop]

Thank you for the PR — just needs one adjustment.

[nosoop]

Thanks!