Fix data-table snapshot

docs/examples/widgets/data_table.py

@@ -2,7 +2,7 @@ import csv
 import io
 
 from textual.app import App, ComposeResult
-from textual.widgets import DataTable, Header
+from textual.widgets import DataTable
 
 CSV = """lane,swimmer,country,time
 4,Joseph Schooling,Singapore,50.39
@@ -17,7 +17,6 @@ CSV = """lane,swimmer,country,time
 
 class TableApp(App):
     def compose(self) -> ComposeResult:
-        yield Header()
         yield DataTable()
 
     def on_mount(self) -> None:

tests/snapshot_tests/test_snapshots.py

@@ -2,10 +2,12 @@ from pathlib import Path
 
 import pytest
 
-# --- Layout related stuff ---
+from textual.app import App
 from textual.widgets import Input
 
 
+# --- Layout related stuff ---
+
 def test_grid_layout_basic(snap_compare):
     assert snap_compare("docs/examples/guide/layout/grid_layout1.py")
 
@@ -63,7 +65,8 @@ def test_input_and_focus(snap_compare):
     assert snap_compare("docs/examples/widgets/input.py", press=press)
 
     # Assert that the state of the Input is what we'd expect
-    input: Input = snap_compare.app.query_one(Input)
+    app: App = snap_compare.app
+    input: Input = app.query_one(Input)
     assert input.value == "Darren"
     assert input.cursor_position == 6