Remove suppress C#8.0+ syntax sugar (for under Unity 2020.2 compatibility)

Author: nowsprinting

.editorconfig

@@ -267,13 +267,6 @@ resharper_switch_statement_handles_some_known_enum_values_with_default_highlight
 # BannedApiAnalyzers
 dotnet_diagnostic.RS0030.severity = error
 
-# Suppress C#8.0+ syntax sugar (for under Unity 2020.2 compatibility)
-# See: https://www.jetbrains.com/help/resharper/Reference__Code_Inspections_CSHARP.html
-resharper_convert_to_using_declaration_highlighting = none
-resharper_convert_to_null_coalescing_compound_assignment_highlighting = none
-resharper_merge_into_logical_pattern_highlighting = none
-resharper_use_negated_pattern_in_is_expression_highlighting = none
-
 # Test codes for Unity Test Framework
 [Tests/**/*.cs]