revert: fix: correct variable name typo in hornerDescending function

This commit reverts 0ee3577.
The use of `ix` as a variable is intentional, as `ix = 1.0 / x`.

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
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  - task: lint_typescript_declarations
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  - task: lint_license_headers
    status: passed
---

Author: kgryte

lib/node_modules/@stdlib/math/base/tools/evalrational-compile-c/lib/main.js

@@ -154,7 +154,7 @@ function hornerDescending( x ) {
 	}
 	str += '{{dtype_suffix}}';
 	for ( i = m-1; i >= 0; i-- ) {
-		str += ' + (x * ';
+		str += ' + (ix * ';
 		if ( i > 0 ) {
 			str += '(';
 		}