FIR IDE: Do not try to shorten type without qualifier

idea/testData/shortenRefsFir/types/ParameterTypeNestedTypeWithoutPackageNotShorten.kt

@@ -0,0 +1,8 @@
+// FIR_COMPARISON
+package test
+
+class T {
+    class TT
+}
+
+<selection>fun foo(t: T.TT) {}</selection>

idea/testData/shortenRefsFir/types/ParameterTypeNestedTypeWithoutPackageNotShorten.kt.after

@@ -0,0 +1,8 @@
+// FIR_COMPARISON
+package test
+
+class T {
+    class TT
+}
+
+fun foo(t: T.TT) {}