printf: Fix octal escapes with leading zeroes

Octal escapes can be written as `\057` or as `\0057`.

Simply ported wrong initially.

fish-rust/src/builtins/printf.rs

@@ -698,7 +698,7 @@ impl<'a> builtin_printf_state_t<'a> {
         while !str.is_empty() {
             let c = str.char_at(0);
             if c == '\\' {
-                let consumed_minus_1 = self.print_esc(str, false);
+                let consumed_minus_1 = self.print_esc(str, true);
                 str = &str[consumed_minus_1..];
             } else {
                 self.append_output(c);

tests/checks/printf.fish

@@ -147,3 +147,7 @@ echo
 printf --help
 echo
 # CHECK: --help
+
+# This is how mc likes to encode the directory we should cd to.
+printf '%b\n' '\0057foo\0057bar\0057'
+# CHECK: /foo/bar/