remove unused parameter from ValidateComposeFile()

In pkg/app/app.go, the function ValidateComposeFile() has an
unused parameter "cmd *cobra.Command".

This commit removes that parameter from the function and the
callers of the function.

cmd/convert.go

@@ -88,7 +88,7 @@ var convertCmd = &cobra.Command{
 
 		// Validate before doing anything else. Use "bundle" if passed in.
 		app.ValidateFlags(GlobalBundle, args, cmd, &ConvertOpt)
-		app.ValidateComposeFile(cmd, &ConvertOpt)
+		app.ValidateComposeFile(&ConvertOpt)
 	},
 	Run: func(cmd *cobra.Command, args []string) {
 

cmd/down.go

@@ -45,7 +45,7 @@ var downCmd = &cobra.Command{
 		}
 
 		// Validate before doing anything else.
-		app.ValidateComposeFile(cmd, &DownOpt)
+		app.ValidateComposeFile(&DownOpt)
 	},
 	Run: func(cmd *cobra.Command, args []string) {
 		app.Down(DownOpt)

cmd/up.go

@@ -60,7 +60,7 @@ var upCmd = &cobra.Command{
 		}
 
 		// Validate before doing anything else.
-		app.ValidateComposeFile(cmd, &UpOpt)
+		app.ValidateComposeFile(&UpOpt)
 	},
 	Run: func(cmd *cobra.Command, args []string) {
 		app.Up(UpOpt)