Fix StyleCop warnings in OpenRA.Mods.RA

OpenRA.Mods.RA/SupportPowers/SupportPower.cs

@@ -21,7 +21,7 @@ namespace OpenRA.Mods.RA.Traits
 		public readonly string LongDesc = "";
 		public readonly bool AllowMultiple = false;
 		public readonly bool OneShot = false;
-		public readonly string[] Prerequisites = {};
+		public readonly string[] Prerequisites = { };
 
 		public readonly string BeginChargeSound = null;
 		public readonly string EndChargeSound = null;