chore: remove deprecated baseUrl from demo app tsconfigs

TS6 deprecates baseUrl (TS5101). The path mappings are already relative,
so they resolve identically against the tsconfig directory.

Author: edusperoni

apps/nativescript-demo-ng/tsconfig.app.json

@@ -2,7 +2,6 @@
   "extends": "./tsconfig.json",
   "compilerOptions": {
     "target": "es2020",
-    "baseUrl": ".",
     "outDir": "../../dist/out-tsc",
     "paths": {
       "~/*": ["./src/*"],

apps/nativescript-demo-ng/tsconfig.spec.json

@@ -2,7 +2,6 @@
   "extends": "./tsconfig.json",
   "compilerOptions": {
     "target": "es2020",
-    "baseUrl": ".",
     "types": ["node", "jasmine"],
     "outDir": "../../dist/out-tsc",
     "paths": {