Remove deprecated key in desktop entry

The Encoding key is deprecated.

Ref: https://specifications.freedesktop.org/desktop-entry-spec/latest/apc.html

Author: abn

install/web-eid.desktop

@@ -1,5 +1,4 @@
 [Desktop Entry]
-Encoding=UTF-8
 Type=Application
 
 Exec=web-eid %F