fix: Fixes missing Netlify Host check (#50)

# Description

The NETLIFY_HOST as fixed in #47 only captured 1 instance where it was
used in 2 different locations.

This fixes the second location

## Issue Ticket Number

<!-- Specifiy which issue this fixes by referencing the issue number
(`#11`) or issue URL. -->
<!-- Example: Fixes
#1 -->

Fixes #45 

## Type of change

<!-- Please select all options that are applicable. -->

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update


# Checklist

<!-- These must all be followed and checked. -->

- [ ] I have followed the contributing guidelines of this project as
mentioned in [CONTRIBUTING.md](/CONTRIBUTING.md)
- [ ] I have created an
[issue](https://github.com/colbyfayock/netlify-plugin-cloudinary/issues)
ticket for this PR
- [ ] I have checked to ensure there aren't other open [Pull
Requests](https://github.com/colbyfayock/netlify-plugin-cloudinary/pulls)
for the same update/change?
- [ ] I have performed a self-review of my own code
- [ ] I have run tests locally to ensure they all pass
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes needed to the documentation

Author: colbyfayock

src/index.js

@@ -25,13 +25,13 @@ module.exports = {
   async onBuild({ netlifyConfig, constants, inputs, utils }) {
     console.log('[Cloudinary] Creating redirects...');
 
-    const { PUBLISH_DIR } = constants;
-
     const isProduction = process.env.CONTEXT === 'production';
     const host = isProduction ? process.env.NETLIFY_HOST : process.env.DEPLOY_PRIME_URL;
 
     console.log(`[Cloudinary] Using host: ${host}`);
 
+    const { PUBLISH_DIR } = constants;
+
     const {
       deliveryType,
       uploadPreset,
@@ -155,7 +155,10 @@ module.exports = {
   async onPostBuild({ constants, inputs, utils }) {
     console.log('[Cloudinary] Replacing on-page images with Cloudinary URLs...');
 
-    const host = process.env.DEPLOY_PRIME_URL || process.env.NETLIFY_HOST;
+    const isProduction = process.env.CONTEXT === 'production';
+    const host = isProduction ? process.env.NETLIFY_HOST : process.env.DEPLOY_PRIME_URL;
+
+    console.log(`[Cloudinary] Using host: ${host}`);
 
     if ( !host ) {
       console.warn(`[Cloudinary] ${ERROR_NETLIFY_HOST_UNKNOWN}`);
@@ -166,7 +169,6 @@ module.exports = {
     const { PUBLISH_DIR } = constants;
     const {
       deliveryType,
-      loadingStrategy,
       uploadPreset,
       folder = process.env.SITE_NAME
     } = inputs;