d/export-patchq: ensure all export patches with same diff-algorithm

Se it explicitly to myres, the current (since quite a bit) default of
git, to avoid noise in exports, just because another developer
prefers another algorithm here.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

debian/scripts/export-patchqueue

@@ -25,6 +25,7 @@ git format-patch \
     --no-cover-letter \
     --zero-commit \
     --no-signature \
+    --diff-algorithm=myers \
     --output-dir \
     "${top}/${kernel_patchdir}" \
     "${base_ref}.."