Wipe on Alt+W as well as put the boxes back

Alt+W only put the boxes back, so wiping needed Ctrl+W or the button.
It now goes both ways, the way N1MM's Wipe button does: with something in
the boxes it clears them, and pressed again on empty boxes it puts back
what it cleared.

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

src/Nonemm.Session/OperatingPosition.cs

@@ -448,7 +448,18 @@ public sealed class OperatingPosition
         ClearEntry();
     }
 
-    /// N1MM's Alt+W: puts back what the last wipe cleared. False when no wipe
+    /// N1MM's Alt+W and its Wipe button: one key both ways. With something in
+    /// the boxes it clears them; with the boxes empty it puts back what the
+    /// last wipe cleared.
+    public void WipeOrRestore()
+    {
+        if (!RestoreWiped())
+        {
+            Wipe();
+        }
+    }
+
+    /// Puts back what the last wipe cleared. False when no wipe
     /// has anything to put back, or when the boxes have something in them
     /// again — N1MM restores into an empty entry only, so nothing typed since
     /// the wipe is lost.