Fix two interaction obstruction checks (#6793)

Content.Server/RCD/Systems/RCDSystem.cs

@@ -161,12 +161,18 @@ namespace Content.Server.RCD.Systems
             }
 
             var coordinates = mapGrid.ToCoordinates(tile.GridIndices);
-            if (coordinates == EntityCoordinates.Invalid ||
+            if (coordinates == EntityCoordinates.Invalid)
-                !_interactionSystem.InRangeUnobstructed(eventArgs.User, coordinates, popup: true))
             {
                 return false;
             }
 
+            var unobstructed = eventArgs.Target == null
+                ? _interactionSystem.InRangeUnobstructed(eventArgs.User, coordinates, popup: true)
+                : _interactionSystem.InRangeUnobstructed(eventArgs.User, eventArgs.Target.Value, popup: true);
+
+            if (!unobstructed)
+                return false;
+
             switch (rcd.Mode)
             {
                 //Floor mode just needs the tile to be a space tile (subFloor)

Resources/Prototypes/Entities/Structures/Wallmounts/air_alarm.yml

@@ -77,6 +77,7 @@
   name: air alarm assembly
   description: An air alarm. Doesn't look like it'll be alarming air any time soon.
   components:
+  - type: WallMount
   - type: Clickable
   - type: InteractionOutline
   - type: Sprite

Resources/Prototypes/Entities/Structures/Wallmounts/fire_alarm.yml

@@ -61,6 +61,7 @@
   name: fire alarm assembly
   description: A fire alarm assembly. Very mild.
   components:
+  - type: WallMount
   - type: Clickable
   - type: InteractionOutline
   - type: Sprite