Turn Loop Restoration on by default

This is an adopted experiment.

Change-Id: If33f700c12fb3fd0f8368714d5e9795aad3729d8
diff --git a/configure b/configure
index 35c7fb9..19da500 100755
--- a/configure
+++ b/configure
@@ -527,6 +527,7 @@
       soft_enable aom_qm
       soft_enable dist_8x8
       soft_enable cdef_singlepass
+      soft_enable loop_restoration
 
       # Provisional adopted
       soft_enable reference_buffer