KT-19390: Fix char + String in Java is converted to code with multiple type errors in Kotlin (#1235)

#KT-19390 Fixed

j2k/testData/fileOrElement/literalExpression/charToString.kt

@@ -0,0 +1,7 @@
+class CharToString {
+    private val value: String? = null
+
+    fun test(): String {
+        return '"'.toString() + value + '"'.toString()
+    }
+}