Disable shadows in compton-tde by default (i.e. if no configuration file could be found)

diff --git a/twin/compton-tde/compton.c b/twin/compton-tde/compton.c
index 257b4c2..c3b0141 100644
--- a/twin/compton-tde/compton.c
+++ b/twin/compton-tde/compton.c
@@ -6291,7 +6291,7 @@
 
   for (i = 0; i < NUM_WINTYPES; ++i) {
     ps->o.wintype_fade[i] = false;
-    ps->o.wintype_shadow[i] = true;
+    ps->o.wintype_shadow[i] = false;
     ps->o.wintype_opacity[i] = 1.0;
   }