fix colon style to match project

src/meson.build

@@ -24,7 +24,7 @@ inc = include_directories('include')
 executable('addtax',
 	sources,
 	include_directories : inc,
-	c_args: c_args,
-	link_args: link_args,
+	c_args : c_args,
+	link_args : link_args,
 	dependencies : [gtk_dep, m_dep, gmodule_dep],
 	install : true)