Fix property 'padStart' does not exist on type 'string'

packages/lesspass-crypto/tsconfig.json

@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
     "target": "ES6",
+    "lib": ["es6", "es2017.string"],
     "moduleResolution": "node",
     "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,