[jhbuild] core-deps-3.28: Drop the '+' from the GTK module

[Emmanuele Bassi <ebassi src gnome org>]

commit 165e4ba94635fb20de9c3d0815c572ddd4570466
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Mar 1 16:47:00 2018 +0700

    core-deps-3.28: Drop the '+' from the GTK module
    
    The repository has changed, and it does not have a '+' any more.

 modulesets/gnome-suites-core-deps-3.28.modules |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/modulesets/gnome-suites-core-deps-3.28.modules b/modulesets/gnome-suites-core-deps-3.28.modules
index 96bf0a7..869b471 100644
--- a/modulesets/gnome-suites-core-deps-3.28.modules
+++ b/modulesets/gnome-suites-core-deps-3.28.modules
@@ -836,7 +836,7 @@ the module and we will just change it to use a tarball anyway.
     </suggests>
   </autotools>
 
-  <meson id="gtk+" mesonargs="-Denable-broadway-backend=true">
+  <meson id="gtk" mesonargs="-Denable-broadway-backend=true">
     <if condition-unset="x11">
       <mesonargs value="-Denable-x11-backend=false"/>
     </if>
@@ -849,7 +849,7 @@ the module and we will just change it to use a tarball anyway.
     <if condition-set="quartz">
       <mesonargs value="-Denable-quartz-backend=true"/>
     </if>
-    <branch/>
+    <branch repo="gitlab.gnome.org"/>
     <dependencies>
       <dep package="atk"/>
       <dep package="glib"/>