narrow: rename getbundlechangegrouppart_nonellipsis function
The function is renamed to getbundlechangegrouppart_widen as per suggestion in
D4383. The motivation is such that we can evolve the function into a handler for
new wire-protocol command.
Differential Revision: https://phab.mercurial-scm.org/D4424
<Include>
<?if $(var.Platform) = "x64" ?>
<?define IsX64 = yes ?>
<?else?>
<?define IsX64 = no ?>
<?endif?>
</Include>