Fix building plugin

Copy's [0] fix

[0] https://github.com/GerritCodeReview/plugins_delete-project/commit/bdb60b25fe44e9e6e460781e3a3f87fdbe4b4f50

Change-Id: I105e2b89b2023c9ef37af92302f618d624eab696

web/tsconfig.json

diff --git a/web/tsconfig.json b/web/tsconfig.json
index 4a70a7d..10dbb2b 100644
--- a/web/tsconfig.json
+++ b/web/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "extends": "../../tsconfig-plugins-base.json",
   "compilerOptions": {
-    "outDir": "../../../.ts-out/plugins/owners", /* overridden by bazel */
+    "rootDir": ".",
     "lib": [
       "dom",
       "dom.iterable",