Set PublishSingleFile default back to false for NET5 compatibility

Author: AndreasJagiella-EH

ElectronNET.CLI/Commands/BuildCommand.cs

@@ -211,7 +211,7 @@ private Dictionary<string, string> GetDotNetPublishFlags(SimpleCommandLineParser
             var dotNetPublishFlags = new Dictionary<string, string>
             {
                 {"/p:PublishReadyToRun", parser.TryGet(_paramPublishReadyToRun, out var rtr) ? rtr[0] : "true"},
-                {"/p:PublishSingleFile", parser.TryGet(_paramPublishSingleFile, out var psf) ? psf[0] : "true"},
+                {"/p:PublishSingleFile", parser.TryGet(_paramPublishSingleFile, out var psf) ? psf[0] : "false"},
             };
 
             if (parser.Arguments.ContainsKey(_paramVersion))
@@ -252,4 +252,4 @@ private Dictionary<string, string> GetDotNetPublishFlags(SimpleCommandLineParser
             return dotNetPublishFlags;
         }
     }
-}
+}