Fixed counter example

If I run this

```
async function main(){
    const NPP = require('./newpieceplease');
    await NPP.create();

    const piece = NPP.getPieceByHash("QmNR2n4zywCV61MeMLB6JwPueAPqheqpfiA4fLPMxouEmQ");
    await NPP.getPracticeCount(piece).then(console.log);
    const cid = await NPP.incrementPracticeCounter(piece);
    await NPP.getPracticeCount(piece).then(console.log);
}

main()
```

The first time, the output is:
```
0
1
```

But the second time, after the database is already created, the output is
```
1
1
```

So, I go into `node` and try some stuff and I find that if you "open" the database with orbitdb.counter(counter.id), then *the value resets*:
```
> const NPP =  require('./newpieceplease')
undefined
> NPP.create()
Promise { <pending> }
> let counter = NPP.orbitdb.counter("test")
undefined
> counter = counter.then(a=>counter=a)
Promise { <pending> }
> let id = counter.id
undefined
> id
'/orbitdb/zdpuAxHhs9pXv7yjEafjvXpLMkUM9dcVVS2JkaS29BYSP3qUE/test'
> counter.value
0
> counter.inc()
Promise { <pending> }
> counter.value
1
> counter = NPP.orbitdb.counter(id)
Promise { <pending> }
> counter = counter.then(a=>counter=a)
Promise { <pending> }
> counter.value
0
```
The manual says: 
> await this.orbitdb.counter(piece.counter) is a new way of using this.orbitdb.counter, by passing in an existing database address. This will open the existing database instead of creating it

I found that if you do the same but load() it seems to work, (adding to the previous node terminal state):
```
> counter.inc()
Promise { <pending> }
> counter.value
1
> counter = NPP.orbitdb.counter(id)
Promise { <pending> }
> counter = counter.then(a=>counter=a)
Promise { <pending> }
> counter.load()
Promise { <pending> }
> counter.value
1
```

Notice how after `counter = NPP.orbitdb.counter(id)` and also `counter.load()` the value did not reset to `0` as it did previously, but was retained.

Just a problem I noticed, following the tutorial, but if I am wrong please let me know, I'm trying to learn :)

Author: tjbdev

01_Tutorial/03_Structuring_Data.md

@@ -85,6 +85,7 @@ Now, add a few functions to `NewPiecePlease` that utilize the counters when nece
 
 + async incrementPracticeCounter (piece) {
 +   const counter = await this.orbitdb.counter(piece.counter)
++   await counter.load()
 +   const cid = await counter.inc()
 +   return cid
 + }