Fixed completion for type parameters broken recently

idea/idea-completion/testData/handlers/basic/TypeParameter.kt

@@ -0,0 +1,7 @@
+package xxx
+
+class A<T> {
+    fun foo(x: <caret>)
+}
+
+// ELEMENT: T

idea/idea-completion/testData/handlers/basic/TypeParameter.kt.after

@@ -0,0 +1,7 @@
+package xxx
+
+class A<T> {
+    fun foo(x: T<caret>)
+}
+
+// ELEMENT: T