Remove Safari from browserslistrc

- ng cli 13.2.0 workaround
- angular/angular-cli#22606

Author: stephanme

ui/.browserslistrc

@@ -11,7 +11,7 @@
 last 1 Chrome version
 last 1 Firefox version
 last 2 Edge major versions
-last 2 Safari major versions
+# last 2 Safari major versions - https://github.com/angular/angular-cli/issues/22606
 last 2 iOS major versions
 Firefox ESR
 not IE 11 # Angular supports IE 11 only as an opt-in. To opt-in, remove the 'not' prefix on this line.