[Catalog] Fix issue with TextField demo getting cut off in horizontal orientation

PiperOrigin-RevId: 675628875

Author: imhappi

catalog/java/io/material/catalog/textfield/res/layout/cat_textfield_content.xml

@@ -24,7 +24,7 @@
   <LinearLayout
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
-    android:layout_margin="@dimen/cat_textfield_standard_spacing"
+    android:padding="@dimen/cat_textfield_standard_spacing"
     android:orientation="vertical">
 
     <!-- Default width of text fields should be 245dp. -->