[context-menu] Fix 'More Actions' sub menu

CL:2265701 enables sub-menus hanging off the file list context menu,
however the menu reference for the 'More Actions' option referenced the
wrong menu.

Changes the 'More Actions' sub menu to refer to 'share-menu' instead of
'share-sub-menu'.

Bug: 1100161
Change-Id: Ifa730a1abef42a4833485fc38258e667848b50a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2275363Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Alex Danilo <adanilo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783838}

ui/file_manager/file_manager/main.html

@@ -184,7 +184,7 @@
         <cr-menu-item command="#open-with"
                   visibleif="full-page" class="hide-on-toolbar" sub-menu="#tasks-menu" hidden></cr-menu-item>
         <cr-menu-item command="#more-actions"
-                  visibleif="full-page" class="hide-on-toolbar" sub-menu="#share-sub-menu" hidden></cr-menu-item>
+                  visibleif="full-page" class="hide-on-toolbar" sub-menu="#share-menu" hidden></cr-menu-item>
         <cr-menu-item command="#go-to-file-location"
                   visibleif="full-page" class="hide-on-toolbar" hidden></cr-menu-item>
         <hr id="tasks-separator" visibleif="full-page" class="hide-on-toolbar" hidden>