Correct random sort logic

If no sort field is specified in GraphQL the server defaults to date created (descending). This incorrectly weighs the random sort results which creates bias towards newer content. 

Adding the random sort field corrects this.

Author: Servbot91

plugins/StashRandomButton/random_button.js

@@ -19,7 +19,7 @@
 
   async function randomGlobal(entity, idField, redirectPrefix, internalFilter) {
     const realEntityPlural = getPlural(entity);
-    let filter = { per_page: 1 };
+    let filter = { per_page: 1, sort: "random" };
     let variables = { filter };
     let filterArg = "";
     let filterVar = "";
@@ -45,7 +45,7 @@
     if (!totalCount) { alert("No results found."); return; }
 
     const randomIndex = Math.floor(Math.random() * totalCount);
-    let itemVars = { filter: { per_page: 1, page: randomIndex + 1 } };
+    let itemVars = { filter: { per_page: 1, page: randomIndex + 1, sort: "random" } };
     if (internalFilter) itemVars.internal_filter = internalFilter;
     const itemQuery = `
       query Find${realEntityPlural}($filter: FindFilterType${filterArg}) {