Fix invalid csharp_space_around_declaration_statements option value

https://learn.microsoft.com/dotnet/fundamentals/code-analysis/style-rules/csharp-formatting-options#csharp_space_around_declaration_statements

Author: xtqqczze

.editorconfig

@@ -140,7 +140,7 @@ csharp_space_after_dot = false
 csharp_space_after_keywords_in_control_flow_statements = true
 csharp_space_after_semicolon_in_for_statement = true
 csharp_space_around_binary_operators = before_and_after
-csharp_space_around_declaration_statements = do_not_ignore
+csharp_space_around_declaration_statements = false
 csharp_space_before_colon_in_inheritance_clause = true
 csharp_space_before_comma = false
 csharp_space_before_dot = false