fix: name of option method call

Signed-off-by: Terry Howe <[email protected]>

cmd/oras/internal/option/platform.go

@@ -82,7 +82,7 @@ type ArtifactPlatform struct {
 // ApplyFlags applies flags to a command flag set.
 func (opts *ArtifactPlatform) ApplyFlags(fs *pflag.FlagSet) {
 	opts.FlagDescription = "set artifact platform"
-	opts.Platform.AppFlags(fs)
+	opts.Platform.ApplyFlags(fs)
 }
 
 // Parse parses the input platform flag to an oci platform type.