give plasma half of co2 air alarm threshold (#22938)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Resources/Prototypes/Atmospherics/thresholds.yml

@@ -39,6 +39,13 @@
   upperWarnAround: !type:AlarmThresholdSetting
     threshold: 0.5
 
+- type: alarmThreshold
+  id: stationPlasma
+  upperBound: !type:AlarmThresholdSetting
+    threshold: 0.00125
+  upperWarnAround: !type:AlarmThresholdSetting
+    threshold: 0.5
+
 - type: alarmThreshold
   id: stationWaterVapor
   upperBound: !type:AlarmThresholdSetting

Resources/Prototypes/Entities/Structures/Piping/Atmospherics/unary.yml

@@ -47,7 +47,7 @@
         Oxygen: stationOxygen
         Nitrogen: ignore
         CarbonDioxide: stationCO2
-        Plasma: danger # everything below is usually bad
+        Plasma: stationPlasma # everything below is usually bad
         Tritium: danger
         WaterVapor: stationWaterVapor
         Ammonia: stationAmmonia
@@ -138,7 +138,7 @@
         Oxygen: stationOxygen
         Nitrogen: ignore
         CarbonDioxide: stationCO2
-        Plasma: danger # everything below is usually bad
+        Plasma: stationPlasma # everything below is usually bad
         Tritium: danger
         WaterVapor: stationWaterVapor
         Ammonia: stationAmmonia

Resources/Prototypes/Entities/Structures/Specific/Atmospherics/sensor.yml

@@ -52,7 +52,7 @@
         Oxygen: stationOxygen
         Nitrogen: ignore
         CarbonDioxide: stationCO2
-        Plasma: danger # everything below is usually bad
+        Plasma: stationPlasma # everything below is usually bad
         Tritium: danger
         WaterVapor: stationWaterVapor
         Ammonia: stationAmmonia