linux delpoyment: use developer property in appdata xml

QtPMbrowser/linux_deploy/de.halaszovich.PMbrowser.appdata.xml.in

@@ -4,7 +4,10 @@
 	<metadata_license>CC0-1.0</metadata_license>
 	<project_license>GPL-3.0-only</project_license>
 	<name>PM browser</name>
-	<developer_name>Christian R. Halaszovich</developer_name>
+	<developer id='de.halaszovich'>
+		<name>Christian R. Halaszovich</name>
+		<url>https://www.halaszovich.de/</url>
+	</developer>
 	<summary>Open, browse and export PM dat files</summary>
 	<description>
 		<p>A tool for electrophysiologists. Open files generated by PatchMaster (Next) and export to IgorPro. Handels .dat files starting from PM version 2.0, in any byte order.</p>