Fix for #4660

Trash trgen assumes the initial directory location to be that where the desc.xml file resides. Any example inputs should be relative to that. So, "examples/" must be part of the string because "**/*.java" includes not only those .java files in "examples/", but also in "target/" and "Generated-*/"!

Author: kaby76

java/java20/desc.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <desc xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../_scripts/desc.xsd">
     <targets>CSharp;Cpp;Dart;Go;Java;JavaScript;Python3;TypeScript;Antlr4ng</targets>
-    <inputs>**/*.java</inputs>
+    <inputs>examples/**/*.java</inputs>
 </desc>