[TMP] Downgrade electron-builder to fix our desktop build

Changelog to 26.0.16 doesn't mention any behavioral changes, still it
breaks our build, and our previous workaround to that still broke the
build in different ways. It is still broken until 26.0.19. We'll need
to figure this out in the future.

element-desktop

@@ -1 +1 @@
-Subproject commit 3307fd2cc4b3831f2b2b887089df2ed1ee95d96f
+Subproject commit 5b383ba625e137cfc5c0f146a72d534670f78a22

overlay/element-desktop/package.json

@@ -7,9 +7,7 @@
     "url": "https://github.com/SchildiChat/schildichat-desktop"
   },
   "homepage": "https://schildi.chat/",
-  "build": {
-    "linux": {
-      "publish": null
-    }
+  "devDependencies": {
+      "electron-builder": "26.0.15"
   }
 }