lib: refactor addEllipsis function to remove unused parameter

Author: miguelmarcondesf

lib/internal/assert/assertion_error.js

@@ -231,8 +231,7 @@ function createErrDiff(actual, expected, operator, customMessage, diffType = 'si
   return `${headerMessage}${skippedMessage}\n${message}\n`;
 }
 
-function addEllipsis(string, diff) {
-  if (diff === 'full') return string;
+function addEllipsis(string) {
   const lines = StringPrototypeSplit(string, '\n', 11);
   if (lines.length > 10) {
     lines.length = 10;
@@ -392,10 +391,10 @@ class AssertionError extends Error {
     const tmpExpected = this.expected;
 
     if (typeof this.actual === 'string') {
-      this.actual = addEllipsis(this.actual, this.diff);
+      this.actual = addEllipsis(this.actual);
     }
     if (typeof this.expected === 'string') {
-      this.expected = addEllipsis(this.expected, this.diff);
+      this.expected = addEllipsis(this.expected);
     }
 
     // This limits the `actual` and `expected` property default inspection to