KT-7815 Smart completion after "as" inserts fq-name for type parameter

#KT-7815 Fixed

idea/idea-completion/testData/handlers/smart/TypeParameterAfterAs.kt

@@ -0,0 +1,5 @@
+package ppp
+
+fun <T> foo(o: Any): T {
+    return o as <caret>
+}

idea/idea-completion/testData/handlers/smart/TypeParameterAfterAs.kt.after

@@ -0,0 +1,5 @@
+package ppp
+
+fun <T> foo(o: Any): T {
+    return o as T<caret>
+}