theseus: bump to 0.3.50 for the extensions-list fixes ship

Cuts the shipping trigger for the changes accumulated since 0.3.49:
translate is bundled (so a fresh install has it out of the box, and
seedBundledAddons reseeds the folder on any install that lost it),
Settings > Extensions no longer double-renders installed extensions
in a separate Community section, and the PDF/DOC data-URI icons the
dock now paints as <img>s ship alongside their addons.

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "theseus-navigator",
-  "version": "0.3.48",
+  "version": "0.3.50",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "theseus-navigator",
-      "version": "0.3.48",
+      "version": "0.3.50",
       "dependencies": {
         "@bch-wc2/interfaces": "^0.0.16",
         "@bitauth/libauth": "^3.1.0-next.8",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "theseus-navigator",
-  "version": "0.3.49",
+  "version": "0.3.50",
   "description": "Theseus Navigator — a browser that follows the thread. By Silent Mode, a Deviant project.",
   "author": "Silent Mode",
   "main": "main.js",