web: fix import order of polyfills causing shadydom to not work on firefox and safari

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

web/.prettierignore

@@ -6,3 +6,5 @@ dist
 coverage
 # don't lint generated code
 api/
+# Import order matters
+poly.ts

web/poly.ts

@@ -1,7 +1,5 @@
-import "@webcomponents/webcomponentsjs";
-import "construct-style-sheets-polyfill";
-
-import "lit/polyfill-support";
-
 // @ts-ignore
 window["polymerSkipLoadingFontRoboto"] = true;
+import "construct-style-sheets-polyfill";
+import "@webcomponents/webcomponentsjs";
+import "lit/polyfill-support";