packaging: normalize - to _ in WiX Id values

- is not a valid identifier character in WiX Ids. So let's
normalize accordingly.

I discovered this issue after a subsequent change which introduces
a directory with a - in its name.

Differential Revision: https://phab.mercurial-scm.org/D9147

contrib/packaging/hgpackaging/wix.py

@@ -165,7 +165,9 b' def make_files_xml(staging_dir: pathlib.'
         if dir_name == '.':
             parent_directory_id = 'INSTALLDIR'
         else:
-            parent_directory_id = 'hg.dir.%s' % dir_name.replace('/', '.')
+            parent_directory_id = 'hg.dir.%s' % dir_name.replace(
+                '/', '.'
+            ).replace('-', '_')
 
         fragment = doc.createElement('Fragment')
         directory_ref = doc.createElement('DirectoryRef')
@@ -178,7 +180,9 b' def make_files_xml(staging_dir: pathlib.'
                 and '/' not in possible_child
                 and possible_child != '.'
             ):
-                child_directory_id = 'hg.dir.%s' % possible_child
+                child_directory_id = ('hg.dir.%s' % possible_child).replace(
+                    '-', '_'
+                )
                 name = possible_child
             else:
                 if not possible_child.startswith('%s/' % dir_name):
@@ -189,7 +193,7 b' def make_files_xml(staging_dir: pathlib.'
 
                 child_directory_id = 'hg.dir.%s' % possible_child.replace(
                     '/', '.'
-                )
+                ).replace('-', '_')
 
             directory = doc.createElement('Directory')
             directory.setAttribute('Id', child_directory_id)