make pdfpcnotes overlay aware

beamertheme-source/pdfpcnotes.dtx

@@ -84,10 +84,10 @@
 
 % define command \pnote{} that works like note but
 % additionally writes notes to file in pdfpc readable format
-\newcommand{\pnote}[2][item]{%
+\newcommand<>{\pnote}[2][item]{%
 	% keep normal notes working
-	\note[#1]{#2}%
-
+	\note[#1]#3{#2}%
+	\only#3{%
 		% if frame changed - write a new header
 		\ifdim\thepage pt>\lastpage pt
 			\let\lastpage\thepage
@@ -99,6 +99,7 @@
 
 		% write note to file
 		\immediate\write\pdfpcnotesfile{\unexpanded{#2}}%
+	}%
 }
 % close file on \begin{document}
 \AtEndDocument{%