FIR: fix type index computation during enhancement

1. in/out type parameters count;
2. star projections take up 1 space in the tree.

compiler/fir/analysis-tests/testData/resolve/kt41984.fir.txt

@@ -22,5 +22,5 @@ FILE: main.kt
     public final fun test_1(b: R|B<kotlin/Int>|, x: R|kotlin/Int|, inv: R|Inv<kotlin/Int>|): R|kotlin/Unit| {
         R|<local>/b|.<Ambiguity: take, [/B.take, /B.take]>#(R|<local>/x|)
         R|<local>/b|.<Ambiguity: take, [/B.take, /B.take]>#(Null(null))
-        R|<local>/b|.R|SubstitutionOverride</B.takeInv: R|kotlin/String|>|(R|<local>/inv|)
+        R|<local>/b|.<Ambiguity: takeInv, [/B.takeInv, /B.takeInv]>#(R|<local>/inv|)
     }

compiler/fir/analysis-tests/testData/resolve/kt41984.kt

@@ -21,11 +21,11 @@ open <!ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED!>class B<!><V> : A<Any, V>() {
         return ""
     }
 
-    override fun takeInv(value: Inv<V>): String = ""
+    <!NOTHING_TO_OVERRIDE!>override<!> fun takeInv(value: Inv<V>): String = ""
 }
 
 fun test_1(b: B<Int>, x: Int, inv: Inv<Int>) {
     b.<!OVERLOAD_RESOLUTION_AMBIGUITY!>take<!>(x)
     b.<!NONE_APPLICABLE!>take<!>(null)
-    b.takeInv(inv)
+    b.<!OVERLOAD_RESOLUTION_AMBIGUITY!>takeInv<!>(inv)
 }

compiler/fir/analysis-tests/testData/resolveWithStdlib/j+k/MyIterable.fir.txt

@@ -8,5 +8,5 @@ FILE: test.kt
     }
     public final fun test(some: R|kotlin/collections/Iterable<kotlin/String>|): R|kotlin/Unit| {
         lval it: R|kotlin/collections/Iterator<kotlin/String>| = R|<local>/some|.R|SubstitutionOverride<kotlin/collections/Iterable.iterator: R|kotlin/collections/Iterator<kotlin/String>|>|()
-        lval split: R|java/util/Spliterator<ft<kotlin/String, kotlin/String?>>| = R|<local>/some|.R|SubstitutionOverride<kotlin/collections/Iterable.spliterator: R|@EnhancedNullability java/util/Spliterator<ft<kotlin/String, kotlin/String?>>|>|()
+        lval split: R|java/util/Spliterator<kotlin/String>| = R|<local>/some|.R|SubstitutionOverride<kotlin/collections/Iterable.spliterator: R|@EnhancedNullability java/util/Spliterator<kotlin/String>|>|()
     }

compiler/fir/analysis-tests/testData/resolveWithStdlib/j+k/typeParameterUse.fir.txt

@@ -1,4 +1,4 @@
 FILE: useSite.kt
     public final fun foo(holder: R|U|, box: R|Box<kotlin/Int>|): R|kotlin/Int| {
-        ^foo R|<local>/holder|.R|/U.getValue|<R|ft<kotlin/Int, kotlin/Int?>|>(R|<local>/box|)
+        ^foo R|<local>/holder|.R|/U.getValue|<R|kotlin/Int|>(R|<local>/box|)
     }