[MIRROR] Station monitoring console patches [MDB IGNORE] (#19086)

* Station monitoring console patches (#73096)

## About The Pull Request

- Distro & Waste loop sensors were only displaying the values of the air
on its turf not the actual pipes they were on, so the values were always
constant. Thats fixed now.
- Created a macro to map chamber id to air sensor to avoid typos. This
also fixed being unable to connect to the waste loop sensor due to a
typo in the word "_sensor".
- When reconnecting to a different chamber other than distro & waste
`atmos_chambers` is not lost when switching so you can once again
connect back to distro & waste. After reconnecting make sure to again
select the chamber from the drop down box cause the ui doesn't update
automatically

https://user-images.githubusercontent.com/110812394/215701505-105eba4d-d5d1-4a09-9ac7-0ab73fee2196.mp4

Fixes #73055
## Changelog
🆑
fix: distro & waste sensors not reading values from the actual pipes
they are on
fix: losing distro & waste options from the drop-down box after
connecting to a new sensor.
refactor: all occurrences of _sensor with a macro to avoid typos.
/🆑

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Co-authored-by: Mothblocks <35135081+Mothblocks@ users.noreply.github.com>

* Station monitoring console patches

---------

Co-authored-by: SyncIt21 <110812394+SyncIt21@users.noreply.github.com>
Co-authored-by: Mothblocks <35135081+Mothblocks@ users.noreply.github.com>

code/modules/atmospherics/machinery/other/meter.dm

@@ -58,6 +58,9 @@
 		icon_state = "meter"
 		SSair.stop_processing_machine(src)
 
+/obj/machinery/meter/return_air()
+	return target?.return_air() || ..()
+
 /obj/machinery/meter/process_atmos()
 	var/datum/gas_mixture/pipe_air = target.return_air()
 	if(!pipe_air)