termio: reset mouse shape on terminal reset

Reset the mouse shape to `.default` when a full reset is done on the
terminal. Prevents the terminal from appearing to be in a persistent
hang

src/termio/Exec.zig

@@ -1680,6 +1680,7 @@ const StreamHandler = struct {
         self: *StreamHandler,
     ) !void {
         self.terminal.fullReset(self.alloc);
+        try self.setMouseShape(.default);
     }
 
     pub fn queryKittyKeyboard(self: *StreamHandler) !void {