Fix spelling of "ShareX" on tools page
Fix spelling of "ShareX" on tools page

As seen on the ShareX project's home page, the correct spelling of the
name is with an uppercase `X`. On the tools page, it is incorrectly an
lowercase `x` (Sharex). This corrects it.

pomf/pomf,pomf/pomf,pomf/pomf-php,alucard0134/Pomf,alucard0134/Pomf,alucard0134/Pomf,ewhal/gpomf