Update EditorConfig rule for public static fields (Azure#7863)

Author: chidozieononiwu

.editorconfig

@@ -65,7 +65,7 @@ dotnet_naming_rule.static_fields_should_have_prefix.style = static_prefix_style
 
 dotnet_naming_symbols.static_fields.applicable_kinds = field
 dotnet_naming_symbols.static_fields.required_modifiers = static
-
+dotnet_naming_symbols.static_fields.applicable_accessibilities = private, internal, private_protected
 dotnet_naming_style.static_prefix_style.required_prefix = s_
 dotnet_naming_style.static_prefix_style.capitalization = camel_case
 
@@ -183,6 +183,3 @@ indent_size = 2
 end_of_line = lf
 [*.{cmd, bat}]
 end_of_line = crlf
-
-# Extra modifications on Corefx rule set
-dotnet_naming_symbols.static_fields.applicable_accessibilities = private, internal