SoftwareInfo hook requires a reference

SoftwareInfos' parameter '$software' requires to submit as reference to
change the value.

Tested on local clean install of 1.24-git, where Elasticsearch version not
appear on Special:Version. Fixed with this.

Change-Id: I398cfbfe85c6fa8efac8e96b385c3c58857e78a7
Merge "SoftwareInfo hook requires a reference"