fix broken path during mimetype installation

dist/linux/debian/postinst

@@ -24,7 +24,7 @@ case "$1" in
           mkdir -p /usr/share/desktop-directories
         fi
         xdg-desktop-menu install --novendor /usr/share/applications/org.cryptomator.Cryptomator.desktop
-        xdg-mime install /usr/share/mime/packages/cryptomator-vault.xml
+        xdg-mime install /usr/share/mime/packages/application-vnd.cryptomator.vault.xml
     ;;
 
     abort-upgrade|abort-remove|abort-deconfigure)

dist/linux/debian/prerm

@@ -22,7 +22,7 @@ case "$1" in
         echo Removing shortcut
 
         xdg-desktop-menu uninstall --novendor /usr/share/applications/org.cryptomator.Cryptomator.desktop
-        xdg-mime uninstall /usr/share/mime/packages/cryptomator-vault.xml
+        xdg-mime uninstall /usr/share/mime/packages/application-vnd.cryptomator.vault.xml
     ;;
 
     failed-upgrade)