Completion after $ in string literal works correctly for classes and objects

idea/testData/completion/handlers/multifile/ObjectInStringTemplate-1.kt

@@ -0,0 +1,3 @@
+fun foo(): String {
+    val s = "$OOO<caret>"
+}

idea/testData/completion/handlers/multifile/ObjectInStringTemplate-2.kt

@@ -0,0 +1,3 @@
+package ppp
+
+object OOOOO

idea/testData/completion/handlers/multifile/ObjectInStringTemplate.kt.after

@@ -0,0 +1,5 @@
+import ppp.OOOOO
+
+fun foo(): String {
+    val s = "${OOOOO<caret>}"
+}