terminology - use icon name not full path ao icon themes can override

desktop file modification - simpler now too.

data/desktop/meson.build

@@ -1,12 +1,2 @@
-icon_sed = 's~%ICON_PATH%~@0@~'.format(join_paths(get_option('prefix'),
-                                                  get_option('datadir'),
-                                                  'icons/hicolor/128x128/apps'))
-
-custom_target(
-  'terminology.desktop',
-  input : 'terminology.desktop.in',
-  output: 'terminology.desktop',
-  command : [sed, icon_sed, '@INPUT@'],
-  capture : true,
-  install : true,
-  install_dir : join_paths(get_option('datadir'), 'applications'))
+install_data('terminology.desktop',
+             install_dir: join_paths(get_option('datadir'), 'applications'))

data/desktop/terminology.desktop

@@ -20,6 +20,6 @@ Comment[ru]=Эмулятор терминала
 Comment[ko]=터미널 에뮬레이터
 Keywords=shell;prompt;command;commandline;
 Exec=terminology
-Icon=%ICON_PATH%/terminology.png
+Icon=terminology
 Categories=System;TerminalEmulator;
 StartupWMClass=terminology