dsearch: rewrite to use CLI instead of api

Modals/Spotlight/FileSearchController.qml

@@ -20,7 +20,7 @@ Item {
     }
 
     function performSearch() {
-        if (!DSearchService.isConnected) {
+        if (!DSearchService.dsearchAvailable) {
             model.clear()
             totalResults = 0
             isSearching = false
@@ -38,8 +38,8 @@ Item {
         const params = {
             "limit": 50,
             "fuzzy": true,
-            "sort_by": "score",
-            "sort_desc": true
+            "sort": "score",
+            "desc": true
         }
 
         if (searchField && searchField !== "all") {

Modals/Spotlight/FileSearchResults.qml

@@ -221,7 +221,7 @@ Rectangle {
                 if (!fileSearchController) {
                     return ""
                 }
-                if (!DSearchService.isConnected) {
+                if (!DSearchService.dsearchAvailable) {
                     return I18n.tr("DankSearch not available")
                 }
                 if (fileSearchController.isSearching) {