fix public structures api route

ot_templating/Resources/Private/Layouts/Classic/Structures.html

@@ -17,7 +17,7 @@
     <div class="content">
         <div class="ot-structures">
             <iframe
-                    src="{ot:request.getOtEnvVar(argument: 'FRAMES_BASE_URI')}/structures/?parent={settings.organizationId}&theme={ot:template.getPreference(key: 'themeColor')}"
+                    src="{ot:request.getOtEnvVar(argument: 'FRAMES_BASE_URI')}/structures/?parents={settings.organizationId}&theme={ot:template.getPreference(key: 'themeColor')}"
                     referrerpolicy="strict-origin"
                     style="border: none;"
                     onload="iFrameResize()"

ot_templating/Resources/Private/Layouts/Modern/Structures.html

@@ -17,7 +17,7 @@
 
         <section class="page-section-ptb">
             <div class="ot-structures">
-                <iframe src="{ot:request.getOtEnvVar(argument: 'FRAMES_BASE_URI')}/structures/?parent={settings.organizationId}&theme={ot:template.getPreference(key: 'themeColor')}"
+                <iframe src="{ot:request.getOtEnvVar(argument: 'FRAMES_BASE_URI')}/structures/?parents={settings.organizationId}&theme={ot:template.getPreference(key: 'themeColor')}"
                         referrerpolicy="strict-origin"
                         style="border: none;"
                         onload="iFrameResize()"