Remove removed linter rules

Author: parlough

analysis_options.yaml

@@ -23,12 +23,9 @@ analyzer:
 
 linter:
   rules:
-    # See all available options here
-    # https://github.com/dart-lang/linter/blob/master/example/all.yaml
+    # See all available options at https://dart.dev/lints
     - always_declare_return_types
     - always_put_control_body_on_new_line
-
-    - always_require_non_null_named_parameters
     - annotate_overrides
     - avoid_empty_else
     - avoid_field_initializers_in_const_classes
@@ -73,7 +70,6 @@ linter:
     - prefer_const_declarations
     - prefer_const_literals_to_create_immutables
     - prefer_contains
-    - prefer_equal_for_default_values
     - prefer_final_fields
     - prefer_final_locals
     - prefer_foreach