tests: Fix incorrect paths for test files

This fixes the meson build with `-Dinstalled_tests=true`

Fixes b5a5f77

Author: bbhtt

tests/meson.build

@@ -105,9 +105,9 @@ if get_option('installed_tests')
     'test-runtime.json',
     'test.json',
     'test.yaml',
-    'tests/org.flatpak_builder.gui.desktop',
-    'tests/org.flatpak_builder.gui.json',
-    'tests/org.flatpak_builder.gui.metainfo.xml',
+    'org.flatpak_builder.gui.desktop',
+    'org.flatpak_builder.gui.json',
+    'org.flatpak_builder.gui.metainfo.xml',
 
     install_dir: installed_testdir,
     install_mode: 'rw-r--r--',