[jhbuild] core-3.26: use the gnome-3-26 to build system-monitor.

[Benoît Dejean <bdejean src gnome org>]

commit 43c2306787d55932cbdba94efefcf61a0e153ca6
Author: Benoît Dejean <bdejean gmail com>
Date:   Sat Nov 4 13:00:03 2017 +0100

    core-3.26: use the gnome-3-26 to build system-monitor.

 modulesets/gnome-suites-core-3.26.modules |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/modulesets/gnome-suites-core-3.26.modules b/modulesets/gnome-suites-core-3.26.modules
index 84d7d84..af2bd1a 100644
--- a/modulesets/gnome-suites-core-3.26.modules
+++ b/modulesets/gnome-suites-core-3.26.modules
@@ -1016,7 +1016,7 @@
   </meson>
 
   <autotools id="gnome-system-monitor">
-    <branch />
+    <branch revision="gnome-3-26"/>
     <dependencies>
       <dep package="intltool"/>
       <dep package="glib"/>