Doesn't print gecko emoji on android ver < 7 (android N) (#3115)

* Doesnt print gecko emoji on android ver < 7

* fixed typo on maybeGecko variable

* Closes #3076: Lizard char now doesn't appear if not supported androidver

* Closes #3115: Prints string instead of gecko emoji in unsupported
android versions

app/src/main/java/org/mozilla/fenix/settings/AboutFragment.kt

@@ -27,10 +27,14 @@ class AboutFragment : Fragment() {
 
         val appName = requireContext().resources.getString(R.string.app_name)
         (activity as AppCompatActivity).title = getString(R.string.preferences_about, appName)
+        var maybeGecko = " \uD83E\uDD8E "
+        if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.N) {
+            maybeGecko = "GV: "
+        }
 
         val aboutText = try {
             val packageInfo = requireContext().packageManager.getPackageInfo(requireContext().packageName, 0)
-            val geckoVersion = PackageInfoCompat.getLongVersionCode(packageInfo).toString() + " \uD83E\uDD8E " +
+            val geckoVersion = PackageInfoCompat.getLongVersionCode(packageInfo).toString() + maybeGecko +
                     GeckoViewBuildConfig.MOZ_APP_VERSION + "-" + GeckoViewBuildConfig.MOZ_APP_BUILDID
             String.format(
                 "%s (Build #%s)",