Don't drop `unregistered` column in reconnection support migration

Antonio Scandurra created 

We don't use this column anymore because, when a project is unshared, we
simply remove it from the `projects` table. However, this column is expected
in the stable version of the server and the database is shared between stable
and preview. If we dropped it, stable would start throwing errors.

Change summary

crates/collab/migrations.sqlite/20221109000000_test_schema.sql   | 3 +
crates/collab/migrations/20221111092550_reconnection_support.sql | 3 -
2 files changed, 3 insertions(+), 3 deletions(-)

Detailed changes

crates/collab/migrations.sqlite/20221109000000_test_schema.sql 🔗 

@@ -44,7 +44,8 @@ CREATE TABLE "projects" (
     "room_id" INTEGER REFERENCES rooms (id) NOT NULL,
     "host_user_id" INTEGER REFERENCES users (id) NOT NULL,
     "host_connection_id" INTEGER NOT NULL,
-    "host_connection_epoch" TEXT NOT NULL
+    "host_connection_epoch" TEXT NOT NULL,
+    "unregistered" BOOLEAN NOT NULL DEFAULT FALSE
 );
 CREATE INDEX "index_projects_on_host_connection_epoch" ON "projects" ("host_connection_epoch");

crates/collab/migrations/20221111092550_reconnection_support.sql 🔗 

@@ -6,8 +6,7 @@ CREATE TABLE IF NOT EXISTS "rooms" (
 ALTER TABLE "projects"
     ADD "room_id" INTEGER REFERENCES rooms (id),
     ADD "host_connection_id" INTEGER,
-    ADD "host_connection_epoch" UUID,
-    DROP COLUMN "unregistered";
+    ADD "host_connection_epoch" UUID;
 CREATE INDEX "index_projects_on_host_connection_epoch" ON "projects" ("host_connection_epoch");
 
 CREATE TABLE "worktrees" (