Preference cast fix. (#1927)

src/en/guya/build.gradle

@@ -5,7 +5,7 @@ ext {
     appName = 'Tachiyomi: Guya'
     pkgNameSuffix = "en.guya"
     extClass = '.Guya'
-    extVersionCode = 6
+    extVersionCode = 7
     libVersion = '1.2'
 }
 

src/en/guya/src/eu/kanade/tachiyomi/extension/en/guya/Guya.kt

@@ -178,7 +178,7 @@ open class Guya() : ConfigurableSource, HttpSource() {
                 "on chapter refresh/update. It will get the next available if " +
                 "your preferred scanlator isn't an option (yet)."
 
-            this.setDefaultValue(1)
+            this.setDefaultValue("1")
 
             setOnPreferenceChangeListener{_, newValue ->
                 val selected = newValue.toString()