scripted-diff: Sort test includes

-BEGIN VERIFY SCRIPT-
 # Mark all lines with #includes
 sed -i --regexp-extended -e 's/(#include <.*>)/\1 /g' $(git grep -l '#include' ./src/bench/ ./src/test ./src/wallet/test/)
 # Sort all marked lines
 git diff -U0 | ./contrib/devtools/clang-format-diff.py -p1 -i -v
-END VERIFY SCRIPT-

src/test/fuzz/base_encode_decode.cpp

@@ -6,8 +6,8 @@
 
 #include <base58.h>
 #include <psbt.h>
-#include <util/string.h>
 #include <util/strencodings.h>
+#include <util/string.h>
 
 #include <cassert>
 #include <cstdint>