[Google] Allow login with custom domains again (#833)

Modified emailWithDomain in UiState

Signed-off-by: Arnau Mora Gras <[email protected]>

app/src/main/kotlin/at/bitfire/davdroid/ui/setup/GoogleLoginModel.kt

@@ -57,7 +57,7 @@ class GoogleLoginModel @AssistedInject constructor(
         val result: LoginInfo? = null
     ) {
         val canContinue = email.isNotEmpty()
-        val emailWithDomain = StringUtils.appendIfMissing(email, "@gmail.com")
+        val emailWithDomain = if (email.contains("@")) email else "$email@gmail.com"
     }
 
     var uiState by mutableStateOf(UiState())