J2K: Quote '$' symbols in converted strings

#KT-6800 Fixed

j2k/testData/fileOrElement/strings/escapedDollar.java

@@ -0,0 +1,6 @@
+public class A {
+    private String dollar1 = "$a";
+    private String dollar2 = "$A";
+    private String dollar3 = "${s}";
+    private String dollar4 = "$$";
+}

j2k/testData/fileOrElement/strings/escapedDollar.kt

@@ -0,0 +1,6 @@
+class A {
+    private val dollar1 = "\$a"
+    private val dollar2 = "\$A"
+    private val dollar3 = "\${s}"
+    private val dollar4 = "$$"
+}