remove spurious Standalone flag from mod metadata

OpenRA.FileFormats/Mod.cs

@@ -24,7 +24,6 @@ namespace OpenRA.FileFormats
 		public string Version;
 		public string Author;
 		public string Requires;
-		public bool Standalone = false;
 
 		public static readonly Dictionary<string, Mod> AllMods = ValidateMods(Directory.GetDirectories("mods").Select(x => x.Substring(5)).ToArray());
 

mods/cnc/mod.yaml

@@ -3,7 +3,6 @@ Metadata:
 	Description: OpenRA Reimagining of the classic game
 	Version: {DEV_VERSION}
 	Author: The OpenRA Developers
-	Standalone: true
 
 Folders:
 	.

mods/d2k/mod.yaml

@@ -3,7 +3,6 @@ Metadata:
 	Description: Work in progress d2k port
 	Version: a0001
 	Author: The OpenRA Developers
-	Standalone: true
 
 Folders:
 	.

mods/default/mod.yaml

@@ -3,7 +3,6 @@ Metadata:
 	Description: Minimal template for creating a base mod
 	Version: a0001
 	Author: The OpenRA Developers
-	Standalone: true
 
 Folders:
 	.

mods/ra/mod.yaml

@@ -3,7 +3,6 @@ Metadata:
 	Description: OpenRA Reimagining of the classic game
 	Version: {DEV_VERSION}
 	Author: The OpenRA Developers
-	Standalone: true
 
 Folders:
 	.