Fix expect declarations available in completion in platform modules

idea/idea-completion/testData/multiPlatform/functionInCommon/common/common.kt

@@ -0,0 +1,11 @@
+package test
+
+expect fun foo()
+
+fun use() {
+    foo<caret>
+}
+
+// ABSENT: { lookupString: foo, module: testModule_JVM }
+// ABSENT: { lookupString: foo, module: testModule_JS }
+// EXIST: { lookupString: foo, module: testModule_Common }

idea/idea-completion/testData/multiPlatform/functionInCommon/js/js.kt

@@ -0,0 +1,3 @@
+package test
+
+actual fun foo() {}

idea/idea-completion/testData/multiPlatform/functionInCommon/jvm/jvm.kt

@@ -0,0 +1,3 @@
+package test
+
+actual fun foo() {}