Revert "Mute failing FirJs tests"

This reverts commit 8b61996.

Author: SmialyKot

tests/mute-common.csv

@@ -1,7 +1,3 @@
 Test key, Issue, State (optional: MUTE or FAIL), Status (optional: FLAKY)
 org.jetbrains.kotlin.daemon.CompilerDaemonTest.testParallelDaemonStart,,,
 org.jetbrains.kotlin.gradle.JsSetupConfigurationCacheIT.checkNodeJsSetup,,,FLAKY
-org.jetbrains.kotlin.js.test.fir.FirJsES6TypeScriptExportTestGenerated.Functions_in_exported_file.testFunctions,,,
-org.jetbrains.kotlin.js.test.fir.FirJsES6TypeScriptExportTestGenerated.Functions.testFunctions,,,
-org.jetbrains.kotlin.js.test.fir.FirJsTypeScriptExportTestGenerated.Functions_in_exported_file.testFunctions,,,
-org.jetbrains.kotlin.js.test.fir.FirJsTypeScriptExportTestGenerated.Functions.testFunctions,,,