Because .kjsm files now contain all declarations from the package (contrary to
the JVM decompiler which produces one file for one class/package facade), some
common decompiled text tests started to behave differently on JVM and JS.
Update two of them (Modifiers, ClassWithClassObject) to make results the same,
copy another (TypeAliases) to JVM-/JS-specific tests with different outputs
For now, JVM and JS backends produce different metadata for package facades (and package parts),
and thus different output is expected for JVM and JS decompiler.
Split decompiler tests into common (decompiledText), JVM-specific (decompiledTextJvm),
and JS-specific (decompiledTextJs)
Join them back together if JS backend migrates to JVM-like package model.
