contactrequestcontentview: improve ui

Change button style, icons and center the layout.

Change-Id: I2931017c8d9c0dcbe532a39dabd3cf182c7a3408
Reviewed-by: Philippe Gorley <philippe.gorley@savoirfairelinux.com>
diff --git a/pixmaps/block.svg b/pixmaps/block.svg
new file mode 100644
index 0000000..1234d34
--- /dev/null
+++ b/pixmaps/block.svg
@@ -0,0 +1,4 @@
+<svg fill="#ffffff" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg">
+    <path d="M-618-1464H782v3600H-618zM0 0h24v24H0z" fill="none"/>
+    <path d="M12 2C6.5 2 2 6.5 2 12s4.5 10 10 10 10-4.5 10-10S17.5 2 12 2zM4 12c0-4.4 3.6-8 8-8 1.8 0 3.5.6 4.9 1.7L5.7 16.9C4.6 15.5 4 13.8 4 12zm8 8c-1.8 0-3.5-.6-4.9-1.7L18.3 7.1C19.4 8.5 20 10.2 20 12c0 4.4-3.6 8-8 8z"/>
+</svg>