ExpressionReplacementPerformer: handle string templates accurately

idea/testData/refactoring/inline/function/expressionBody/StringTemplate.kt

@@ -0,0 +1,4 @@
+fun foo() {
+    fun bar() = ""
+    val y = "!!x=${<caret>bar()}!!"
+}

idea/testData/refactoring/inline/function/expressionBody/StringTemplate.kt.after

@@ -0,0 +1,3 @@
+fun foo() {
+    val y = "!!x=!!"
+}