feat(console-wallet): shift+tab to go to prev tab (#3748)

Description
---
- Shift + Tab goes to the previous tab

Motivation and Context
---
If tab goes to next tab, shift + tab should go to previous tab 

How Has This Been Tested?
---
Manually

applications/tari_console_wallet/src/ui/app.rs

@@ -130,6 +130,10 @@ impl<B: Backend> App<B> {
         }
     }
 
+    pub fn on_backtab(&mut self) {
+        self.tabs.previous();
+    }
+
     pub fn on_up(&mut self) {
         self.tabs.on_up(&mut self.app_state);
     }

applications/tari_console_wallet/src/ui/mod.rs

@@ -122,6 +122,7 @@ fn crossterm_loop(mut app: App<CrosstermBackend<Stdout>>) -> Result<(), ExitCode
                 (KeyCode::Backspace, _) => app.on_backspace(),
                 (KeyCode::Enter, _) => app.on_key('\n'),
                 (KeyCode::Tab, _) => app.on_key('\t'),
+                (KeyCode::BackTab, _) => app.on_backtab(),
                 (KeyCode::F(10), _) => app.on_f10(),
                 _ => {},
             },