mount: disable debug log for test

I don't recall any recent problems with that test.

cmd/restic/cmd_mount_integration_test.go

@@ -14,7 +14,6 @@ import (
 
 	systemFuse "github.com/anacrolix/fuse"
 	"github.com/restic/restic/internal/data"
-	"github.com/restic/restic/internal/debug"
 	"github.com/restic/restic/internal/global"
 	"github.com/restic/restic/internal/restic"
 	rtest "github.com/restic/restic/internal/test"
@@ -274,11 +273,6 @@ func TestMountSameTimestamps(t *testing.T) {
 		t.Skip("Skipping fuse tests")
 	}
 
-	debugEnabled := debug.TestLogToStderr(t)
-	if debugEnabled {
-		defer debug.TestDisableLog(t)
-	}
-
 	env, cleanup := withTestEnvironment(t)
 	// must list snapshots more than once
 	env.gopts.BackendTestHook = nil