Fix playwright-common Dockerfile (#33855)

* Fix playwright-common Dockerfile

ARG needs putting before the FROM to use it in the FROM, and after the FROM to use it within the stage.

* Apply suggestion from @t3chguy

packages/playwright-common/Dockerfile

@@ -1,6 +1,8 @@
-# Expose the argument to this build stage
+# Expose the argument for use in FROM
 ARG PLAYWRIGHT_VERSION
 FROM mcr.microsoft.com/playwright:v${PLAYWRIGHT_VERSION}-noble
+# Expose the argument to this build stage
+ARG PLAYWRIGHT_VERSION
 
 WORKDIR /work