Drop old enum syntax. Comma / semicolon are now a syntactic part of enum entry.

Comma must present now between enum entries, semicolon between last entry & first member, constructor calls must be without colons / specifiers.
A swarm of tests fixed accordingly.

compiler/testData/loadJava/compiledKotlin/enum/enumWithInnerClasses.kt

@@ -2,7 +2,7 @@
 package test
 
 enum class Enum {
-    ENTRY1 ENTRY2
+    ENTRY1, ENTRY2;
 
     inner class Inner