Put the wiped entry boxes back on Alt+W

N1MM wipes on Ctrl+W and puts the boxes back on Alt+W, which this had no
key for. A wipe now keeps the call, the exchange, the name, the comment
and the sent time, and Alt+W fills them in again.

Wiping empty boxes keeps what the wipe before it held, and the boxes are
only filled in again when they are empty, so nothing typed since the wipe
is thrown away. A call moved onto the call stack is not kept: it has not
gone anywhere and putting it back would make a second copy of it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015NZkFxHde1iifAQemFTHxf

src/Nonemm.App/Windows/EntryWindow.axaml

@@ -71,6 +71,7 @@
       </MenuItem>
       <MenuItem Header="_Edit">
         <MenuItem Header="Wipe Out Entry Fields" Click="OnWipe" InputGesture="Ctrl+W" />
+        <MenuItem Header="Restore Wiped Entry Fields" Click="OnRestoreWiped" InputGesture="Alt+W" />
         <Separator />
         <MenuItem Header="Edit Last Contact" Click="OnEditLastContact" InputGesture="Ctrl+Y" />
         <MenuItem Header="Add a Note to Last/Current Contact" Click="OnAddNote" InputGesture="Ctrl+N" />