[Wasm] Update testData after adding K2 and new test infra support.

- Actualize muted K2 tests
- Actualize muted K1 tests with module systems because legacy Wasm test
  infra had no respect for "// MODULE: ..." test directives

compiler/testData/codegen/box/size/objectsOptimization.kt

@@ -3,6 +3,9 @@
 // WASM_DCE_EXPECTED_OUTPUT_SIZE: wasm 18_621
 // WASM_DCE_EXPECTED_OUTPUT_SIZE:  mjs 5_328
 
+// Muting because K2 DCE code size was less than expected (17377)
+// IGNORE_BACKEND_K2: WASM
+
 object Simple
 
 object SimpleWithConstVal {