This isnt required, but it can be a little bit strange having TFA and non TFA weapons together.

If you would like to remove them, make backups and delete the following files from your server in YOURSERVERNAME\garrysmod\gamemodes\terrortown\entities\weapons:

weapon_ttt_glock.lua
weapon_ttt_m16.lua
weapon_ttt_sipistol.lua
weapon_zm_mac10.lua
weapon_zm_pistol.lua
weapon_zm_revolver.lua
weapon_zm_rifle.lua
weapon_zm_shotgun.lua
weapon_zm_sledge.lua

Any other weapons can be disabled from spawning by editing the lua file and setting "SWEP.AutoSpawnable = true" to false.

Be aware that some maps only place spawns for default weapons, so you may need to use the TTT weapon spawn placer. Another option would be to use a loadout system.