C++: Update to regexpMatch.

Author: geoffw0

cpp/ql/lib/semmle/code/cpp/security/SensitiveExprs.qll

@@ -14,10 +14,7 @@ import cpp
  */
 bindingset[s]
 private predicate suspicious(string s) {
-  s.matches([
-      "%password%", "%passwd%", "%accountid%", "%account%key%", "%accnt%key%", "%license%key%",
-      "%trusted%"
-    ]) and
+  s.regexpMatch(".*(password|passwd|accountid|account.?key|accnt.?key|license.?key|trusted).*") and
   not s.matches(["%hash%", "%crypt%", "%file%", "%path%", "%invalid%"])
 }