[evince/wip/gpoo/flatpak-platform] build: Use platform/master as runtime instead of SDK

[Germán Poo-Caamaño <gpoo src gnome org>]

commit d3dc3e31adce96a61a77955cde0c28b26809f5ff
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Sat Jun 26 16:49:37 2021 -0400

    build: Use platform/master as runtime instead of SDK
    
    Fixes #1557

 build-aux/flatpak/org.gnome.Evince.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/build-aux/flatpak/org.gnome.Evince.json b/build-aux/flatpak/org.gnome.Evince.json
index da77458d..45d0dd70 100644
--- a/build-aux/flatpak/org.gnome.Evince.json
+++ b/build-aux/flatpak/org.gnome.Evince.json
@@ -1,6 +1,6 @@
 {
     "app-id" : "org.gnome.Evince",
-    "runtime" : "org.gnome.Sdk",
+    "runtime" : "org.gnome.Platform",
     "runtime-version" : "master",
     "sdk" : "org.gnome.Sdk",
     "command" : "evince",