JS: move expressions test to box tests

js/js.translator/testData/box/expression/misc/exclExclThrows.kt

@@ -0,0 +1,14 @@
+package foo
+
+
+fun box(): String {
+    val a: Int? = null
+
+    try {
+        if ((a!! + 3) == 3) return "fail1"
+    }
+    catch (e: Throwable) {
+        return "OK"
+    }
+    return "fail2"
+}