[geary] Update POTFILES.in

[Piotr Drąg <piotrdrag src gnome org>]

commit 6db6e7ab5f38b62beadb23a6c23be41a0fee29f7
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Tue Jan 8 20:01:50 2019 +0100

    Update POTFILES.in

 po/POTFILES.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 7a7364d1..50387e02 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -429,5 +429,5 @@ ui/main-window.ui
 ui/main-window-info-bar.ui
 ui/password-dialog.glade
 ui/preferences-dialog.ui
-ui/problem-details-dialog.vala
+ui/problem-details-dialog.ui
 ui/upgrade_dialog.glade