KT-6628 Allow imports of classes from root package

#KT-6628 Fixed

compiler/testData/resolve/ImportFromRootScope.resolve

@@ -16,13 +16,13 @@ fun foo() {
 // FILE: otherPackage.kt
 package test
 
-import `!`Klass
-import `!`function
-import `!`property
+import `k`Klass
+import `f`function
+import `p`property
 
 fun foo() {
-    `!`Klass()
-    `!`function()
-    `!`property
+    `k`Klass()
+    `f`function()
+    `p`property
 }
 

compiler/testData/resolve/ImportingRootScopeWhenProcessingImports.resolve

@@ -21,9 +21,9 @@ fun foo() {
 
 // FILE: nonRoot.kt
 package nonRoot
-import java.lang.* // will not import Fake
+import java.lang.* // will import Fake
 
 fun foo() {
-    `!`Fake()
-    java.lang.`!`Fake() // qualification doesn't help, because we are in other package
+    `Fake`Fake()
+    java.lang.`!`Fake() // qualified access to root package's class does not work
 }