fixup! Omnibox: Add DDG, Startpage, Disconnect, Youtube, Twitter; remove Amazon, eBay, bing

bug 42290: change duckduckgoonion to duckduckgo onion and same for startpageonion

browser/components/search/extensions/ddg-onion/manifest.json

 {
-  "name": "DuckDuckGoOnion",
+  "name": "DuckDuckGo (.onion)",
   "description": "Duck Duck Go Onion",
   "manifest_version": 2,
   "version": "1.0",
@@ -17,7 +17,7 @@
   ],
   "chrome_settings_overrides": {
     "search_provider": {
-      "name": "DuckDuckGoOnion",
+      "name": "DuckDuckGo (.onion)",
       "search_url": "https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion",
       "search_form": "https://duckduckgogg42xjoc72x3sjasowoarfbgcmvfimaftt6twagswzczad.onion/?q={searchTerms}",
       "search_url_get_params": "q={searchTerms}",

browser/components/search/extensions/startpage-onion/manifest.json

 {
-  "name": "StartpageOnion",
+  "name": "Startpage (.onion)",
   "description": "Startpage Onion",
   "manifest_version": 2,
   "version": "1.0",
@@ -17,7 +17,7 @@
   ],
   "chrome_settings_overrides": {
     "search_provider": {
-      "name": "StartpageOnion",
+      "name": "Startpage (.onion)",
       "search_url": "http://startpagel6srwcjlue4zgq3zevrujfaow726kjytqbbjyrswwmjzcqd.onion/sp/search",
       "search_form": "http://startpagel6srwcjlue4zgq3zevrujfaow726kjytqbbjyrswwmjzcqd.onion/sp/search/",
       "search_url_post_params": "q={searchTerms}"