Fix suggestOnly tab issue #74

[ChesterYue]

Issue: #74

---

@kapalex 's pr: #122 (didn't merged by conflict) try to fix.

But involved a bug:

this.rl.input.emit('keypress', '\b', { name: 'backspace' });
if (autoCompleted.includes(this.rl.line)) {
  this.rl.write(autoCompleted.replace(this.rl.line, '')); // Bugged line
}

Case passed

// when:
this.rl.line === 'a'; autoCompleted === 'apple';

// bugged line goes to:
this.rl.write('pple');
// equals to:
this.rl.line = 'a' + 'pple';

// result passed:
this.rl.line === 'apple' === autoCompleted

Case failed

// when:
this.rl.line === 'p'; autoCompleted === 'apple';

// bugged line goes to:
this.rl.write('aple');
// equals to:
this.rl.line = 'a' + 'aple';

// result failed:
this.rl.line === 'aaple' !== autoCompleted

---

This pr is inspired by his solution, fixed the issue:

this.rl.input.emit('keypress', '\b', {name: 'backspace'}); // Remove redundant tab.
if (autoCompleted.includes(this.rl.line)) {
  this.rl.line = '';
  this.rl.write(autoCompleted);
  this.rl.input.emit('keypress', '\b', {name: 'right'}); // Calibrate cursor to right position.
}