Align tsconfig with ts_project outputs

rules_ts validates that path-affecting TypeScript options are known to
Bazel. The codemirror editor tsconfig inherited rootDir from the shared
plugin config and also declared an outDir that was overridden by the
ts_project rule.

Override rootDir locally and remove the stale outDir so the effective
tsconfig matches the package-local ts_project outputs.

Change-Id: I956a2714df87d22237409adca021b5256b64c749

web/tsconfig.json

diff --git a/web/tsconfig.json b/web/tsconfig.json
index 78051ab..65940e1 100644
--- a/web/tsconfig.json
+++ b/web/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "extends": "../../tsconfig-plugins-base.json",
   "compilerOptions": {
-    "outDir": "../../../.ts-out/plugins/codemirror-editor", /* overridden by bazel */
+    "rootDir": "."
   },
   "include": [
     "**/*.ts"