Fix .editorconfig to disallow `this`

(cherry picked from commit be29fc6adb2c8d8e52afea301118cf413bdc2d57)

.editorconfig

@@ -19,10 +19,10 @@ indent_size = 4
 dotnet_sort_system_directives_first = true
 
 # Avoid "this." and "Me." if not necessary
-dotnet_style_qualification_for_field = false:refactoring
-dotnet_style_qualification_for_property = false:refactoring
-dotnet_style_qualification_for_method = false:refactoring
-dotnet_style_qualification_for_event = false:refactoring
+dotnet_style_qualification_for_field = false:warning
+dotnet_style_qualification_for_property = false:warning
+dotnet_style_qualification_for_method = false:warning
+dotnet_style_qualification_for_event = false:warning
 
 # Indentation preferences
 csharp_indent_block_contents = true
@@ -32,10 +32,6 @@ csharp_indent_case_contents_when_block = true
 csharp_indent_switch_labels = true
 csharp_indent_labels = flush_left
 
-dotnet_style_qualification_for_field = false:suggestion
-dotnet_style_qualification_for_property = false:suggestion
-dotnet_style_qualification_for_method = false:suggestion
-dotnet_style_qualification_for_event = false:suggestion
 dotnet_naming_style.instance_field_style.capitalization = camel_case
 dotnet_naming_style.instance_field_style.required_prefix = _