Escape special names with backticks in test data

#KT-51248

compiler/testData/loadJava/compiledKotlin/fun/DeclaredMemberOverridesDelegated.txt

@@ -3,7 +3,7 @@ package test
 public final class B : test.X, test.Y {
     /*primary*/ public constructor B(/*0*/ a: test.X)
     public final val a: test.X
-        public final fun <get-a>(): test.X
+        public final fun `<get-a>`(): test.X
     public open override /*2*/ fun foo(): kotlin.Unit
 }