data: use metainfo instead appdata

Component metadata of type desktop-application as described in Section 2.2, “Desktop Applications” can be installed with an .appdata.xml extension as well for historical reasons.

https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html

Signed-off-by: David Heidelberg <[email protected]>

Author: okias

data/com.github.bleakgrey.tootle.appdata.xml.in renamed to data/com.github.bleakgrey.tootle.metainfo.xml.in

@@ -28,8 +28,8 @@ i18n.merge_file(
 )
 
 i18n.merge_file(
-    input: meson.project_name() + '.appdata.xml.in',
-    output: meson.project_name() + '.appdata.xml',
+    input: meson.project_name() + '.metainfo.xml.in',
+    output: meson.project_name() + '.metainfo.xml',
     po_dir: join_paths(meson.source_root(), 'po'),
     install: true,
     install_dir: join_paths(get_option('datadir'), 'metainfo')