[FIR] Don't approximate captured types

This fixes some type argument mismatch errors caused by a captured type
being approximated and then captured again.
Some places need to be adapted to work with captured types that
previously only worked with approximated types.

#KT-62959 Fixed

compiler/testData/codegen/box/builderInference/issues/kt52838b.kt

@@ -2,9 +2,6 @@
 // ISSUE: KT-52838
 
 // IGNORE_LIGHT_ANALYSIS
-// IGNORE_BACKEND_K2: WASM
-// REASON: That still doesn't work properly with PCLA, but accidentally don't fails for other tests but WASM
-// (see KT-52838 for tracking and same-named diagnostic test)
 
 fun box(): String {
     build {

compiler/testData/codegen/box/builderInference/issues/kt52838c.kt

@@ -1,10 +1,6 @@
 // ISSUE: KT-52838
 // JVM_ABI_K1_K2_DIFF: KT-64738
 
-// IGNORE_BACKEND_K2: WASM
-// REASON: That still doesn't work properly with PCLA, but accidentally don't fails for other tests but WASM
-// (see KT-52838 for tracking and same-named diagnostic test)
-
 fun box(): String {
     build {
         this as DerivedBuildee<*>