gr-file-list - fix non-existing properties

gr-diff-host doesn't have inline-index property and this property
doesn't appear anywhere else.

Change-Id: Iaaa6eb4bfa52df61133325222b1e87a9ee7a8330

polygerrit-ui/app/elements/change/gr-file-list/gr-file-list.html

@@ -433,7 +433,6 @@ limitations under the License.
                 no-auto-render
                 show-load-failure
                 display-line="[[_displayLine]]"
-                inline-index=[[index]]
                 hidden="[[!_isFileExpanded(file.__path, _expandedFilePaths.*)]]"
                 change-num="[[changeNum]]"
                 patch-range="[[patchRange]]"