windows: remove positional mods from termwiz overlay panes

otherwise, the termwiz line reader can become confused and
fail to recognize key presses like `(` which have SHIFT and LEFT_SHIFT
set.

refs: #3999

docs/changelog.md

@@ -45,6 +45,7 @@ As features stabilize some brief notes about them will accumulate here.
 #### Fixed
 * Command Palette was using now-invalid Nerd Font 2.0 symbols for macOS
   keyboard shortcuts. #3988
+* Windows: couldn't use shifted keys like `(` in the Debug Overlay. #3999
 
 ### 20230712-072601-f4abf8fd
 

mux/src/termwiztermtab.rs

@@ -210,7 +210,10 @@ impl Pane for TermWizTerminalPane {
     }
 
     fn key_down(&self, key: KeyCode, modifiers: KeyModifiers) -> anyhow::Result<()> {
-        let event = InputEvent::Key(KeyEvent { key, modifiers });
+        let event = InputEvent::Key(KeyEvent {
+            key,
+            modifiers: modifiers.remove_positional_mods(),
+        });
         if let Err(e) = self.input_tx.send(event) {
             *self.dead.lock() = true;
             return Err(e.into());