FIR: Fix capturing of flexible types

compiler/testData/diagnostics/tests/generics/kt9203.fir.kt

@@ -6,6 +6,6 @@ import java.util.stream.IntStream
 
 fun main() {
     val xs = IntStream.range(0, 10).mapToObj { it.toString() }
-            .<!INAPPLICABLE_CANDIDATE!>collect<!>(Collectors.toList())
+            .collect(Collectors.toList())
     <!UNRESOLVED_REFERENCE!>xs[0]<!>
-}
+}

compiler/testData/diagnostics/tests/j+k/collectorInference.fir.kt

@@ -7,8 +7,8 @@ import java.util.stream.Collectors
 import java.util.stream.Stream
 
 fun test(a: Stream<String>) {
-    a.<!INAPPLICABLE_CANDIDATE!>collect<!>(Collectors.toList()) <!INAPPLICABLE_CANDIDATE!>checkType<!> { <!UNRESOLVED_REFERENCE!>_<!><MutableList<String>>() }
+    a.collect(Collectors.toList()) checkType { <!UNRESOLVED_REFERENCE!>_<!><MutableList<String>>() }
     // actually the inferred type is platform
-    a.<!INAPPLICABLE_CANDIDATE!>collect<!>(Collectors.toList()) <!INAPPLICABLE_CANDIDATE!>checkType<!> { <!UNRESOLVED_REFERENCE!>_<!><List<String?>>() }
+    a.collect(Collectors.toList()) checkType { <!UNRESOLVED_REFERENCE!>_<!><List<String?>>() }
 }
 

compiler/testData/diagnostics/tests/targetedBuiltIns/stream.fir.kt

@@ -8,6 +8,6 @@ interface A : Collection<String> {
 }
 
 fun foo(x: List<String>, y: A) {
-    x.stream().filter { it.length > 0 }.<!INAPPLICABLE_CANDIDATE!>collect<!>(Collectors.toList())
+    x.stream().filter { it.length > 0 }.collect(Collectors.toList())
     y.stream().filter { it.length > 0 }
 }