change matches to equality

Co-authored-by: Rasmus Wriedt Larsen <rasmuswriedtlarsen@gmail.com>

java/ql/lib/semmle/code/java/security/InsufficientKeySize.qll

@@ -38,7 +38,7 @@ private module Asymmetric {
       Sink() {
         exists(KeyPairGenInit kpgInit, KeyPairGen kpg |
           algoName in ["RSA", "DSA", "DH"] and
-          kpg.getAlgoName().matches(algoName) and
+          kpg.getAlgoName() = algoName and
           DataFlow::localExprFlow(kpg, kpgInit.getQualifier()) and
           this.asExpr() = kpgInit.getKeySizeArg()
         )