[Bug 34195] obsolete patch

[chpe]

Public bug reported:
https://launchpad.net/malone/bugs/34195

Affects: epiphany-browser (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
patches/04_user_agent.patch is obsolete (the code it patches is compiled
out) and unnecessary anyway since the UA string inherited from ff
already includes a Ubuntu/ part; no need to add it to epiphany's version
again.