Break word for disabled functions in the php system info page

[brianteeman]

If you have a "crazy" long list of disabled php functions then this can break the layout of the page as there are no spaces in the string.

You can see this in the screenshots #5686

This PR add the class word-break to the td to prevent this happening. To test it I had to manual insert a long list of disabled functions using chrome inspector

[pe7er]

@test
Patch works good:
The list of Disabled Functions is split over multiple lines.
Clearly visible if you make your browser window smaller.

[waader]

@test works!

[brianteeman]

Setting RTC - thanks

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