sudoers/@include: fails to parse backslash inside quotes

[Jorge Aparicio]

relevant test

sudo-rs/test-framework/sudo-compliance-tests/src/sudoers/include.rs

Lines 96 to 105 in 85aecc4

 fn backslash_in_name_double_quotes() -> Result<()> { 
     let env = Env(r#"@include "/etc/sudo\ers" "#) 
         .file(r#"/etc/sudo\ers"#, SUDOERS_ALL_ALL_NOPASSWD) 
         .build()?; 
  
     Command::new("sudo") 
         .arg("true") 
         .output(&env)? 
         .assert_success() 
 } 

the backslash does not need to be escaped when it appears inside double quotes