Fix removal of kubebuilder imports marker #135

What version of GCI are you using?

v0.9.0

Reproduce Steps

package main

import (
	"os"
	"fmt"
	// +kubebuilder:scaffold:imports
)

Run gci print .

What did you expect to see?

package main

import (
        "fmt"
        "os"
        // +kubebuilder:scaffold:imports
)

What did you see instead?

package main

import (
        "fmt"
        "os"
)

This breaking change was introduced in #120. You can verify by checking the output of v0.8.2 vs v0.8.3.