Fixed KT-5611 Completion doesn't include not imported extensions for implicit receiver

#KT-5611 Fixed

idea/testData/quickfix/autoImports/extensionFunctionImportImplicitReceiver.after.kt

@@ -0,0 +1,9 @@
+// "Import" "true"
+// ERROR: Unresolved reference: someFun
+package testingExtensionFunctionsImport
+
+import testingExtensionFunctionsImport.data.someFun
+
+fun String.some() {
+    <caret>someFun()
+}

idea/testData/quickfix/autoImports/extensionFunctionImportImplicitReceiver.before.Main.kt

@@ -0,0 +1,7 @@
+// "Import" "true"
+// ERROR: Unresolved reference: someFun
+package testingExtensionFunctionsImport
+
+fun String.some() {
+    <caret>someFun()
+}

idea/testData/quickfix/autoImports/extensionFunctionImportImplicitReceiver.before.data.Sample.kt

@@ -0,0 +1,4 @@
+package testingExtensionFunctionsImport.data
+
+fun String.someFun() {
+}