fix crash in split example

examples/split.rs

@@ -13,12 +13,10 @@ use tui_textarea::{Input, Key, TextArea};
 fn inactivate(textarea: &mut TextArea<'_>) {
     textarea.set_cursor_line_style(Style::default());
     textarea.set_cursor_style(Style::default());
-    let b = textarea
-        .block()
-        .cloned()
-        .unwrap_or_else(|| Block::default().borders(Borders::ALL));
     textarea.set_block(
-        b.style(Style::default().fg(Color::DarkGray))
+        Block::default()
+            .borders(Borders::ALL)
+            .style(Style::default().fg(Color::DarkGray))
             .title(" Inactive (^X to switch) "),
     );
 }
@@ -26,11 +24,12 @@ fn inactivate(textarea: &mut TextArea<'_>) {
 fn activate(textarea: &mut TextArea<'_>) {
     textarea.set_cursor_line_style(Style::default().add_modifier(Modifier::UNDERLINED));
     textarea.set_cursor_style(Style::default().add_modifier(Modifier::REVERSED));
-    let b = textarea
+    textarea.set_block(
-        .block()
+        Block::default()
-        .cloned()
+            .borders(Borders::ALL)
-        .unwrap_or_else(|| Block::default().borders(Borders::ALL));
+            .style(Style::default())
-    textarea.set_block(b.style(Style::default()).title(" Active "));
+            .title(" Active "),
+    );
 }
 
 fn main() -> io::Result<()> {