lib: cleanup validation

Used the `validateInteger()` validator to cleanup validation and keep
consistency.

PR-URL: #39652
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

lib/internal/tty.js

@@ -29,10 +29,7 @@ const {
   StringPrototypeToLowerCase,
 } = primordials;
 
-const {
-  ERR_INVALID_ARG_TYPE,
-  ERR_OUT_OF_RANGE
-} = require('internal/errors').codes;
+const { validateInteger } = require('internal/validators');
 
 let OSRelease;
 
@@ -221,13 +218,9 @@ function hasColors(count, env) {
     env = count;
     count = 16;
   } else {
-    if (typeof count !== 'number') {
-      throw new ERR_INVALID_ARG_TYPE('count', 'number', count);
-    }
-    if (count < 2) {
-      throw new ERR_OUT_OF_RANGE('count', '>= 2', count);
-    }
+    validateInteger(count, 'count', 2);
   }
+
   return count <= 2 ** getColorDepth(env);
 }