cmd/gofmt: update TestRewrite to avoid future regressions

CL 162337 changed go/ast to better handle block comments,
but was reverted because it introduced an off-by-one bug.
This CL adds a test case to enforce the correct behavior
so that future changes do not break this again.

Updates #18929
Updates #33538

Change-Id: I2d25c139d007f8db1091b7a48b1dd20c584e2699
Reviewed-on: https://go-review.googlesource.com/c/go/+/190523
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

src/cmd/gofmt/testdata/import.golden

@@ -8,6 +8,11 @@ import (
 	"math"
 )
 
+import (
+	"fmt"
+	"math"
+)
+
 import (
 	"fmt"
 

src/cmd/gofmt/testdata/import.input

@@ -8,6 +8,9 @@ import (
 	"io"
 )
 
+import("fmt"
+"math")
+
 import (
 	"fmt"