Fixed bug in import insertion: it did not work with descriptors taken before modifications

idea/testData/shortenRefs/descriptorsChangeAfterImportInsertion.dependency.kt

@@ -0,0 +1,4 @@
+package bar
+
+class Class1
+class Class2

idea/testData/shortenRefs/descriptorsChangeAfterImportInsertion.kt

@@ -0,0 +1,4 @@
+// ALL_UNDER_IMPORTS: true
+package foo
+
+<selection>fun foo(p: bar.Class1): bar.Class2 { }</selection>

idea/testData/shortenRefs/descriptorsChangeAfterImportInsertion.kt.after

@@ -0,0 +1,6 @@
+// ALL_UNDER_IMPORTS: true
+package foo
+
+import bar.*
+
+fun foo(p: Class1): Class2 { }