Include hidden field with API key in status check to prevent it from disappearing when saving settings before the check completed.

Author: Edwin Westerhoud

src/views/account-status-loading.php

@@ -4,5 +4,9 @@
 			'Retrieving account status',
 			'tiny-compress-images'
 		); ?></p>
+
+    <input type="hidden" id="<?php echo esc_attr( self::get_prefixed_name( 'api_key' ) ); ?>"
+      name="<?php echo esc_attr( self::get_prefixed_name( 'api_key' ) ); ?>" size="35" spellcheck="false"
+      value="<?php echo esc_attr( $key ); ?>">
 	</div>
 </div>

src/views/account-status-update.php

@@ -15,8 +15,8 @@
 			), $link );
 		?></p>
 
-		<input type="text" id="tinypng_api_key"
-			name="tinypng_api_key" size="35" spellcheck="false"
+		<input type="text" id="<?php echo esc_attr( self::get_prefixed_name( 'api_key' ) ); ?>"
+			name="<?php echo esc_attr( self::get_prefixed_name( 'api_key' ) ); ?>" size="35" spellcheck="false"
 			value="<?php echo esc_attr( $key ); ?>">
 
 		<button class="button button-primary" data-tiny-action="update-key"><?php