try to make the interactive test less flaky

It seems like it's not getting the last item sometimes,
because the readline doesn't see it in time, or something.

Just keep repeating the last entry if it asks again.

test/bin.js

@@ -339,13 +339,18 @@ t.test('interactive deletes', t => {
           }, 10000)
           child.stdout.setEncoding('utf8')
           child.stderr.setEncoding('utf8')
+          let last = ''
           child.stdout.on('data', async c => {
             await new Promise(r => setTimeout(r, 50))
             out.push(c.trim())
             const s = script.shift()
             if (s !== undefined) {
+              last === s
               out.push(s.trim())
               child.stdin.write(s + '\n')
+            } else {
+              // keep writing whatever the last option was
+              child.stdin.write(last + '\n')
             }
           })
           child.stderr.on('data', c => {