[calls] tests: Add gsettings schema directory to environment

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 6477446a29709d94a7efe004c8d21a51e2fc6dc7
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Thu Sep 23 10:10:25 2021 +0200

    tests: Add gsettings schema directory to environment

 tests/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/tests/meson.build b/tests/meson.build
index 8e123047..ecec6b92 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -11,6 +11,7 @@ test_env = [
   'CALLS_SIP_TEST=1',
   'CALLS_AUDIOSRC=audiotestsrc',
   'CALLS_AUDIOSINK=fakesink',
+  'GSETTINGS_SCHEMA_DIR=@0@/data'.format(meson.project_build_root()),
 ]
 
 test_cflags = [