Update utilities.inc

[edlington]

Reinstates code to fix ISLANDORA-1795: Fix "invalid clip parametters passed" error if base URL path is a sub dir #67. See: https://github.com/Islandora/islandora_openseadragon/pull/67/files/e0b6712c87022edb7efe573bf521e4c0573cf91c

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