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/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|)
     }