roundcubemail: fix update over an existing version
This update fixes the following issue for roundcubemail:
-bnc#872790: remove possible 'leftover' SQL directory from document root, preventing upgrades from versions > 0.9.5
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Submitted by
Aeneas Jaißle (aeneas_jaissle)
Fixed bugs
bnc#872790
Update Roundcube mail from 0.9.4.2.1.1 -> 0.9.5-2.10.1 fails
