Fix bug: should use sdkInt as the property to compare (#3865)

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Task/Issue URL: https://app.asana.com/0/0/1205952041108121/f 

### Description
Bug fix: 
- replaces `appBuildConfig.versionCode` with `appBuildConfig.sdkInt` in
the OS version guard.

### Steps to test this PR

QA optional

Author: CDRussell

autofill/autofill-impl/src/main/java/com/duckduckgo/autofill/impl/systemautofill/SystemAutofillServiceSuppressor.kt

@@ -36,7 +36,7 @@ class RealSystemAutofillServiceSuppressor @Inject constructor(
 
     @SuppressLint("NewApi")
     override fun suppressAutofill(webView: WebView?) {
-        if (appBuildConfig.versionCode >= Build.VERSION_CODES.O) {
+        if (appBuildConfig.sdkInt >= Build.VERSION_CODES.O) {
             webView?.context?.getSystemService(AutofillManager::class.java)?.cancel()
         }
     }