ListBuffer.patchInPlace does not update last0 field, leaving the buffer in a corrupted state

## Reproduction steps

Scala version: 2.13.10

```scala
    import collection.mutable.ListBuffer
    val buffer = ListBuffer(1)
    val patch = Seq(2)
    buffer.patchInPlace(1, patch, 2)
    println(buffer.last)
```

## Problem
Prints `1`
