Add units to small file sizes in resolve

The `ls` and `resolve` commands shows my `.pinset` entry as having a size of `60`. Let's force it to add units in all cases.

```sh
? > ls
.       2.4G  QmSc9pcnm4N1QC1u2oSNL6eRgFjxDq2Aex6cGhTkvw91xc
.pinset 60    QmYJmoKWDFh1wmZLATh3fiVzMuhhTyNm9NLGuLEJM7HdNZ
dapps   17.5M QmQN6bA5YEPEaPDUDLq6o9fm24Ye2bbnA4YUT2rBeAR5cm
foo     2.4G  QmPkNdFzNFZfM9QixL3ZowBNvveFmufbnRuM36K1SrnmB1
```