Fix normalize arguments when fstring_formatting is disabled (#13910)

crates/ruff_python_formatter/src/string/implicit.rs

@@ -371,8 +371,9 @@ impl Format<PyFormatContext<'_>> for FormatLiteralContent {
             0,
             self.flags,
             self.flags.is_f_string() && !self.is_fstring,
-            true,
-            false,
+            // TODO: Remove the argument from `normalize_string` when promoting the `is_f_string_formatting_enabled` preview style.
+            self.flags.is_f_string() && !is_f_string_formatting_enabled(f.context()),
+            is_f_string_formatting_enabled(f.context()),
         );
 
         // Trim the start and end of the string if it's the first or last part of a docstring.

crates/ruff_python_formatter/src/string/normalize.rs

@@ -626,7 +626,7 @@ pub(crate) fn normalize_string(
     let mut formatted_value_nesting = 0u32;
 
     while let Some((index, c)) = chars.next() {
-        if matches!(c, '{' | '}') && is_fstring {
+        if matches!(c, '{' | '}') {
             if escape_braces {
                 // Escape `{` and `}` when converting a regular string literal to an f-string literal.
                 output.push_str(&input[last_index..=index]);