[web] enable always_specify_types for web_ui

lib/web_ui/analysis_options.yaml

@@ -8,6 +8,7 @@ include: ../../analysis_options.yaml
 
 linter:
   rules:
+    always_specify_types: true # avoid_dynamic_calls needs to be cleaned up before we can start relying on type inference
     avoid_dynamic_calls: false
     avoid_print: false
     avoid_setters_without_getters: false