added const to gf-tile

Author: shravyackm

lib/components/list_tile/gf_list_tile.dart

@@ -65,7 +65,7 @@ class GFListTile extends StatelessWidget {
                     titleText != null
                         ? Text(
                             titleText,
-                            style: TextStyle(
+                            style: const TextStyle(
                                 fontSize: 17,
                                 fontWeight: FontWeight.w500,
                                 color: GFColors.DARK),