Fix TemplateProcessor :: fixBrokenMacros;

The current regex causes the loss of the original formatting of some documents after the variables have been overwritten.
Replaces the current regex with one that resolves this problem.
New regex from @brainwood
/\$(?:\{|[^{$]*\>\{)[^}$]*\}/U

The brainwood's pull request was rejected due to pipe regex delimiters "|"

Author: yurii-sio2

src/PhpWord/TemplateProcessor.php

@@ -445,7 +445,7 @@ protected function fixBrokenMacros($documentPart)
         $fixedDocumentPart = $documentPart;
 
         $fixedDocumentPart = preg_replace_callback(
-            '|\$[^{]*\{[^}]*\}|U',
+            '/\$(?:\{|[^{$]*\>\{)[^}$]*\}/U',
             function ($match) {
                 return strip_tags($match[0]);
             },