[gardening] Rename flutter/flutter patch so it matches engines hash.

Change-Id: Iacf28ee3096411527dfa263890825e9ffefe513a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/97060
Reviewed-by: Alexander Aprelev <aam@google.com>
diff --git a/tools/patches/flutter-flutter/7418238239f885ba92093c44a1768f8ec93b121f.patch b/tools/patches/flutter-flutter/403337ebb893380101d1fa9cc435ce9b6cfeb22c.patch
similarity index 100%
rename from tools/patches/flutter-flutter/7418238239f885ba92093c44a1768f8ec93b121f.patch
rename to tools/patches/flutter-flutter/403337ebb893380101d1fa9cc435ce9b6cfeb22c.patch