Issue #14997: disable <F5> in idle shell window.

Thanks to Roger Serwy for patch.
diff --git a/Lib/idlelib/config-extensions.def b/Lib/idlelib/config-extensions.def
index 78b68f6..39e69ce 100644
--- a/Lib/idlelib/config-extensions.def
+++ b/Lib/idlelib/config-extensions.def
@@ -46,6 +46,8 @@
 
 [ScriptBinding]
 enable=1
+enable_shell=0
+enable_editor=1
 [ScriptBinding_cfgBindings]
 run-module=<Key-F5>
 check-module=<Alt-Key-x>