Spectators no longer visible in thermalvision (#1666)

A check was added to prevent spectators from being displayed with
thermal vision. This is relevant in cases where players are highlighted
by TV and then killed, as they are not automatically removed from the
entity list. Also prevents SpecDM players from being seen.

CHANGELOG.md

@@ -18,6 +18,7 @@ All notable changes to TTT2 will be documented here. Inspired by [keep a changel
 - Fixed the rounds left always displaying one less than actually left (by @TimGoll)
 - Fixed rendering glitches in the loading screen (by @TimGoll)
 - Fixed weapon pickup through walls (by @MrXonte)
+- Fixed spectating player still being visible through thermalvision after killing that player (by @MrXonte)
 
 ### Changed
 

lua/ttt2/libraries/thermalvision.lua

@@ -139,7 +139,7 @@ local function RenderHook()
             local entry = thermalvisionList[i]
             local ent = entry.ent
 
-            if not IsValid(ent) then
+            if not IsValid(ent) or (ent:IsPlayer() and not ent:IsTerror()) then
                 continue
             end