Merge bitcoin#29967: test: Add two more urlDecode tests

fa55972 test: Add two more urlDecode tests (MarcoFalke)

Pull request description:

  Trivial follow-up after bitcoin#29904 (comment)

ACKs for top commit:
  laanwj:
    Code review ACK bitcoin@fa55972
  fjahr:
    ACK fa55972
  stickies-v:
    ACK fa55972
  Sjors:
    utACK fa55972

Tree-SHA512: 99916feebb35b5670a365120f962fd6c28cb124635c99ac3ee3520dfc130bd1672f43b06b05b7b0b9e563d223bd009f8d6622817a2d2b4ee24596af40e2cdfaf

src/test/common_url_tests.cpp

@@ -54,6 +54,9 @@ BOOST_AUTO_TEST_CASE(decode_malformed_test) {
     BOOST_CHECK_EQUAL(UrlDecode(" %Z "), " %Z ");
     BOOST_CHECK_EQUAL(UrlDecode(" % X"), " % X");
 
+    BOOST_CHECK_EQUAL(UrlDecode("%%ffg"), "%\xffg");
+    BOOST_CHECK_EQUAL(UrlDecode("%fg"), "%fg");
+
     BOOST_CHECK_EQUAL(UrlDecode("%-1"), "%-1");
     BOOST_CHECK_EQUAL(UrlDecode("%1-"), "%1-");
 }