update sha1 hash for ioncube 4.4.3 x64 edition

just attempted to install ioncube decoder version 4.4.3 and it returned an error with:

```
==> Downloading http://downloads3.ioncube.com/loader_downloads/ioncube_loaders_dar_x86-64.tar.gz
######################################################################## 100.0%
Error: SHA1 mismatch
Expected: c2b8afc997fedd2ee4027996dda5067192cc8135
Actual: 3b1d1b48d03ea4cda3083070333b4b68c74ef1b8
Archive: /Library/Caches/Homebrew/php54-ioncubeloader-4.4.3.tar.gz
```

updated the hash to the new value. chances are they changed the package. they don't publish their own hashes so we need to keep them updated.