Fix FSEntry_Func 33
Detail: It appears that this entry (Get usage of offset) was never updated to support the "BigDir" directory format (E+/F+, long filenames, >77 entries per directory) at RISC OS 4. This results in OS_FSControl 52 also failing for such discs. Admin: Tested using SDFS, but should apply equally to any other FileCore filing system. Version 3.54. Tagged as 'FileCore-3_54'
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