Doc: Copyright: Fix embedded font file location

Author: wodry

contrib/debian/copyright

@@ -87,7 +87,7 @@ Files: src/qt/res/icons/proxy.png
 Copyright: Cristian Mircea Messel
 License: public-domain
 
-Files: src/qt/fonts/RobotoMono-Bold.ttf
+Files: src/qt/res/fonts/RobotoMono-Bold.ttf
 License: Apache-2.0
 Comment: Site: https://fonts.google.com/specimen/Roboto+Mono