Fix LWC attribute with --embedded-language-formatting off (#18383)

Co-authored-by: fisker <lionkay@gmail.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

changelog_unreleased/lwc/18383.md

@@ -0,0 +1,13 @@
+#### Avoid quote around interpolations (#18383 by @kovsu)
+
+<!-- prettier-ignore -->
+```html
+<!-- Input -->
+<div foo={bar}>   </div>
+
+<!-- Prettier stable (--embedded-language-formatting off) -->
+<div foo="{bar}"></div>
+
+<!-- Prettier main (--embedded-language-formatting off) -->
+<div foo={bar}></div>
+```