[lld] [lld][ELF] Fix a corner case of elf::getLoongArchPageDelta (PR #71907)

[Jessica Clarke via llvm-commits]

jrtc27 wrote:

I'll also note that the inconsistent positioning of the `'`s in the numbers (groups of 4 for halfwords vs 3 and 5 to match the relocations) is pretty confusing to read at a glance, possibly even making it less clear than not having them, since one expects them to be in the same place.

https://github.com/llvm/llvm-project/pull/71907