Checks if a machine has no research before connecting techweb (#72944)

## About The Pull Request

Currently all machines, if the config to not have a techweb link is on,
will set their node to science even if they were meant to be connected
to another (like through subtypes). This fixes that by checking to
ensure they don't have a techweb connected already before giving them a
new one.

Also as a minor fix, RD consoles will now properly add themselves to the
list of accessing RD consoles if they aren't linking to the default.
This list currently does nothing but I can see good uses of it in the
future.

## Why It's Good For The Game

Fixes an error that was found on a downstream, it's a worthwhile fix
that thankfully was caught this early.

## Changelog

Nothing player-facing.

code/modules/modular_computers/file_system/programs/frontier.dm

@@ -24,7 +24,7 @@
 
 /datum/computer_file/program/scipaper_program/on_start(mob/living/user)
 	. = ..()
-	if(!CONFIG_GET(flag/no_default_techweb_link))
+	if(!CONFIG_GET(flag/no_default_techweb_link) && !linked_techweb)
 		linked_techweb = SSresearch.science_tech
 
 /datum/computer_file/program/scipaper_program/application_attackby(obj/item/attacking_item, mob/living/user)

code/modules/modular_computers/file_system/programs/techweb.dm

@@ -23,7 +23,7 @@
 
 /datum/computer_file/program/science/on_start(mob/living/user)
 	. = ..()
-	if(!CONFIG_GET(flag/no_default_techweb_link))
+	if(!CONFIG_GET(flag/no_default_techweb_link) && !stored_research)
 		stored_research = SSresearch.science_tech
 
 /datum/computer_file/program/science/application_attackby(obj/item/attacking_item, mob/living/user)