Change the keyboard shortcut for the preview pane

ctrl-P clashes with the system default for “Print” on Windows (and
Linux?)

core/wiki/config/shortcuts/shortcuts.multids

@@ -13,7 +13,7 @@ list-number: ctrl-N
 mono-block: ctrl-shift-M
 mono-line: ctrl-M
 picture: ctrl-shift-I
-preview: ctrl-P
+preview: alt-P
 quote: ctrl-Q
 save-tiddler: ctrl+enter
 stamp: ctrl-S