scripted-diff: Remove trailing whitespaces

-BEGIN VERIFY SCRIPT-

sed --in-place'' --regexp-extended 's/[[:space:]]+$//g' $(git grep -I --files-with-matches --extended-regexp '[[:space:]]+$' -- src test  ':!*.svg' ':!src/crypto/sha256_sse4*' ':!src/leveldb' ':!src/qt/locale' ':!src/secp256k1' ':!src/univalue')

-END VERIFY SCRIPT-

src/test/serialize_tests.cpp

@@ -252,8 +252,8 @@ static bool isCanonicalException(const std::ios_base::failure& ex)
 
     // The string returned by what() can be different for different platforms.
     // Instead of directly comparing the ex.what() with an expected string,
-    // create an instance of exception to see if ex.what() matches 
-    // the expected explanatory string returned by the exception instance. 
+    // create an instance of exception to see if ex.what() matches
+    // the expected explanatory string returned by the exception instance.
     return strcmp(expectedException.what(), ex.what()) == 0;
 }