[fractal] Fix a bug when trying to go to far in the history with keyboard shortcuts

[Daniel Garcia Moreno <danigm src gnome org>]

commit 2e3e1fb6f7a74071f97b4cc0e4ddf40d9dcf64bc
Author: Baptiste Gelez <baptiste gelez xyz>
Date:   Sat May 11 15:15:35 2019 +0100

    Fix a bug when trying to go to far in the history with keyboard shortcuts

 fractal-gtk/src/actions/global.rs | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)
---
diff --git a/fractal-gtk/src/actions/global.rs b/fractal-gtk/src/actions/global.rs
index f3c27afb..69d6cc19 100644
--- a/fractal-gtk/src/actions/global.rs
+++ b/fractal-gtk/src/actions/global.rs
@@ -189,16 +189,12 @@ pub fn new(app: &gtk::Application, op: &Arc<Mutex<AppOp>>) {
         }
     }));
     older_messages.connect_activate(clone!(op => move |_, _| {
-        let mut op = op.lock().unwrap();
-        if let Some(ref mut hist) = op.history {
-            // println!("page up");
+        if let Some(ref mut hist) = op.lock().unwrap().history {
             hist.page_up();
         }
     }));
     newer_messages.connect_activate(clone!(op => move |_, _| {
-        let mut op = op.lock().unwrap();
-        if let Some(ref mut hist) = op.history {
-            // println!("page down");
+        if let Some(ref mut hist) = op.lock().unwrap().history {
             hist.page_down();
         }
     }));