clear the search bar if the user changes categories (#752)

Co-authored-by: nyx <nnyyxxxx@users.noreply.github.com>

tui/src/filter.rs

@@ -164,4 +164,8 @@ impl Filter {
             self.search_input.remove(current);
         }
     }
+    pub fn clear_search(&mut self) {
+        self.search_input.clear();
+        self.input_position = 0;
+    }
 }

tui/src/state.rs

@@ -783,6 +783,7 @@ impl AppState {
             0usize,
         )];
         self.selection.select(Some(0));
+        self.filter.clear_search();
         self.update_items();
     }