Rename files to preserve history

Test\Eslint fail - this is expected.

Change-Id: I98bea8c785253cd4c2c090fa723b54ecf6800d32
diff --git a/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.js b/polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.ts
similarity index 100%
rename from polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.js
rename to polygerrit-ui/app/elements/edit/gr-editor-view/gr-editor-view.ts