Change return type of Char plus Int and Char minus Int binary operations.

JS: Remove unnecessary intrinsic binary operation patterns, adjust intrinsics for binary operations with char.

js/js.translator/testData/char/cases/charBinaryOperations.kt

@@ -2,10 +2,10 @@ package foo
 
 fun box(): String {
 
-    assertEquals(75, 'A' + 10)
-    assertEquals(55, 'A' - 10)
+    assertEquals('K', 'A' + 10)
+    assertEquals('7', 'A' - 10)
 
-    assertEquals(4, '4' - '0')
+    assertEquals(3, 'd' - 'a')
 
     return "OK"
 }