to not be set if they have their default value. This is the case on
Windows for instance.

Remove ZeroMemory() calls and instead set iSubItem = 0 manually.

gphoto2.ds: Remove ZeroMemory() calls and instead set the relevant fields (usually just iSubItem) to zero manually.

taskmgr: Remove ZeroMemory() calls and instead set the relevant fields (usually just iSubItem) to zero manually.

Fix on_selection_change() and on_remove_app_click() so they do set iSubItem = 0.