Bug 38664: The tidy script - fix race condition

There was a race condition, edit_file trying to open it while it was not
fully written by prettier (?) This is a dirty fix but it seems to do the
trick.

The error was:
edit_file 'koha-tmpl/intranet-tmpl/prog/en/includes/cat-search.inc' - write_file: No such file or directory at misc/devel/tidy.pl line 149.

Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>

misc/devel/tidy.pl

@@ -138,6 +138,8 @@ sub tidy_tt {
             run( command => sprintf q{yarn --silent run prettier --write %s}, $file );
         if ($success) {
 
+            while ( !-f $file ) { sleep 1; }
+
             # Revert the substitutions done by the prettier plugin
             edit_file sub {
                 s#<!--</head>-->#</head>#g;