Revert "tmp: implement a hack to fix LA test"

This reverts commit 0387ce0365.

This change was not needed because the 'IGNORE_BACKEND_K1: JVM'
directive makes the test generated as ignored, in this case it is the
method named `ignoreSignedToUnsignedConversions` which is not even
recognized as a test.

compiler/testData/codegen/box/unsignedTypes/signedToUnsignedConversions.kt

@@ -1,8 +1,6 @@
 // WITH_STDLIB
 // !LANGUAGE: +ImplicitSignedToUnsignedIntegerConversion
 // IGNORE_BACKEND_K1: JVM
-// dedicated hack to avoid unmuting this test in light analysis, see comments in AbstractLightAnalysisModeTest
-// FAIL_IN_LIGHT_ANALYSIS
 // FILE: signedToUnsignedConversions_annotation.kt
 
 package kotlin.internal