mod_storage_gdbm: Fix typo in unused field on store instance
mod_storage_gdbm: Fix typo in unused field on store instance

amenophis1er/prosody-modules,obelisk21/prosody-modules,syntafin/prosody-modules,obelisk21/prosody-modules,obelisk21/prosody-modules,vince06fr/prosody-modules,amenophis1er/prosody-modules,vince06fr/prosody-modules,syntafin/prosody-modules,vince06fr/prosody-modules,obelisk21/prosody-modules,syntafin/prosody-modules,amenophis1er/prosody-modules,syntafin/prosody-modules,vince06fr/prosody-modules,amenophis1er/prosody-modules,amenophis1er/prosody-modules,vince06fr/prosody-modules,obelisk21/prosody-modules,syntafin/prosody-modules