Pull in SortableJS from NPM again.

SortableJS/Sortable#2095 has been merged so we no longer need to use
our fork.

package.json

@@ -127,6 +127,6 @@
     }
   },
   "resolutions": {
-    "sortablejs": "git+https://github.com/thelounge/Sortable.git"
+    "sortablejs": "1.15.0"
   }
 }

yarn.lock

@@ -6498,10 +6498,10 @@ socks@^2.6.1:
     ip "^1.1.5"
     smart-buffer "^4.2.0"
 
-[email protected], "sortablejs@git+https://github.com/thelounge/Sortable.git":
-  version "1.14.0"
-  uid "9730c70cd48da38d8feb3dd6808b1893157d8dfb"
-  resolved "git+https://github.com/thelounge/Sortable.git#9730c70cd48da38d8feb3dd6808b1893157d8dfb"
+[email protected], sortablejs@1.15.0:
+  version "1.15.0"
+  resolved "https://registry.yarnpkg.com/sortablejs/-/sortablejs-1.15.0.tgz#53230b8aa3502bb77a29e2005808ffdb4a5f7e2a"
+  integrity sha512-bv9qgVMjUMf89wAvM6AxVvS/4MX3sPeN0+agqShejLU5z5GX4C75ow1O2e5k4L6XItUyAK3gH6AxSbXrOM5e8w==
 
 source-map-js@^1.0.2:
   version "1.0.2"
@@ -6586,7 +6586,6 @@ sprintf-js@~1.0.2:
 
 "sqlite3@https://github.com/mapbox/node-sqlite3#918052b538b0effe6c4a44c74a16b2749c08a0d2":
   version "5.0.2"
-  uid "918052b538b0effe6c4a44c74a16b2749c08a0d2"
   resolved "https://github.com/mapbox/node-sqlite3#918052b538b0effe6c4a44c74a16b2749c08a0d2"
   dependencies:
     "@mapbox/node-pre-gyp" "^1.0.0"