"To ordinary string literal": don't add unnecessary escapes to characters in template expression

#KT-36406 Fixed

idea/testData/intentions/toOrdinaryStringLiteral/quotesInExpression.kt

@@ -0,0 +1,4 @@
+// WITH_RUNTIME
+fun test(list: List<Int>) {
+    val s = <caret>"""foo ${list.joinToString(", ")} bar"""
+}

idea/testData/intentions/toOrdinaryStringLiteral/quotesInExpression.kt.after

@@ -0,0 +1,4 @@
+// WITH_RUNTIME
+fun test(list: List<Int>) {
+    val s = "foo ${list.joinToString(", ")} bar"
+}

idea/testData/intentions/toOrdinaryStringLiteral/trimIndent10.kt

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+data class Column(val name: String)
+
+fun test(columns: List<Column>) {
+    val sql = <caret>"""
+        SELECT ${columns.joinToString(", ")} FROM foo
+    """.trimIndent()
+}

idea/testData/intentions/toOrdinaryStringLiteral/trimIndent10.kt.after

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+data class Column(val name: String)
+
+fun test(columns: List<Column>) {
+    val sql = "SELECT ${columns.joinToString(", ")} FROM foo"
+}

idea/testData/intentions/toOrdinaryStringLiteral/trimIndent11.kt

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+fun test(list: List<Int>) {
+    val s = <caret>"""
+        "\foo
+        ${list.joinToString(",")}
+        "\bar
+    """.trimIndent()
+}

idea/testData/intentions/toOrdinaryStringLiteral/trimIndent11.kt.after

@@ -0,0 +1,4 @@
+// WITH_RUNTIME
+fun test(list: List<Int>) {
+    val s = "\"\\foo\n${list.joinToString(",")}\n\"\\bar"
+}