[JS IR] Don't mark Char as a value class

Char will still be treated as a value class
(see JsInlineClassesUtils.kt)

js/js.translator/testData/box/char/charEquals.kt

@@ -1,14 +1,16 @@
 // EXPECTED_REACHABLE_NODES: 1372
 package foo
 
-class A
-
 fun box(): String {
 
     assertEquals(true, 'A' == 'A')
-    assertEquals(false, 'A'== 'B')
+    assertEquals(false, 'A' == 'B')
     assertEquals(false, ('A' as Any) == (65 as Any))
 
+    // FIXME(KT-50157): assertEquals(true, 'A' === 'A')
+    assertEquals(false, 'A' === 'B')
+    assertEquals(false, ('A' as Any) === (65 as Any))
+
     assertTrue(bar('Q'))
     assertFalse(bar('W'))