Make Hardsuits Not Destroy Ears (#1710)

# Description

They're *just a bit* too loud. A 5db reduction should be enough. My
salvage techs were complaining of migraines.

# Changelog

:cl:
- tweak: Made hardsuits 5db quieter.

Resources/Prototypes/Entities/Clothing/OuterClothing/base_clothingouter.yml

@@ -208,6 +208,8 @@
   - type: EmitsSoundOnMove
     soundCollection:
       collection: FootstepHardsuitLight
+      params:
+        volume: -5
     requiresWorn: true
     distanceWalking: 2
     distanceSprinting: 3
@@ -221,6 +223,8 @@
   - type: EmitsSoundOnMove
     soundCollection:
       collection: FootstepHardsuitMedium
+      params:
+        volume: -5
     requiresWorn: true
     distanceWalking: 2
     distanceSprinting: 3
@@ -255,6 +259,8 @@
   - type: EmitsSoundOnMove
     soundCollection:
       collection: FootstepHardsuitHeavy
+      params:
+        volume: -5
     requiresWorn: true
     distanceWalking: 2
     distanceSprinting: 3