Clean up lints config.

Removed rules which are already included by flutter_lints.

analysis_options.yaml

@@ -22,13 +22,10 @@ linter:
   # `// ignore_for_file: name_of_lint` syntax on the line or in the file
   # producing the lint.
   rules:
-    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
-    prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
-    unawaited_futures: true  # Explicitly mark futures which are not being awaited
-    use_super_parameters: true
-    prefer_relative_imports: true
-    avoid_relative_lib_imports: true
-    directives_ordering: true
+    - prefer_single_quotes
+    - unawaited_futures  # Explicitly mark futures which are not being awaited
+    - directives_ordering  # Force ordering of imports
+    - prefer_relative_imports
 
 # Additional information about this file can be found at
 # https://dart.dev/guides/language/analysis-options