[gnome-calculator] Added new UI file to POTFILES.in

[Robert Roth <robertroth src gnome org>]

commit f6a8bc1825b999906603bbc42fb3a9b38837af6d
Author: Robert Roth <robert roth off gmail com>
Date:   Sat Jun 6 10:27:27 2020 +0300

    Added new UI file to POTFILES.in

 po/POTFILES.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 8db4179f..69480635 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -29,6 +29,7 @@ src/math-display.vala
 src/ui/math-function-popover.ui
 src/math-function-popover.vala
 src/math-preferences.vala
+src/ui/math-preferences.ui
 src/ui/math-shortcuts.ui
 src/ui/math-variable-popover.ui
 src/math-variable-popover.vala