chore: Bump preference from alpha01 to beta01 and fix errors (#1992)

Author: liveHarshit

app/build.gradle

@@ -122,7 +122,7 @@ dependencies {
     implementation "androidx.room:room-rxjava2:${roomVersion}"
     kapt "androidx.room:room-compiler:${roomVersion}"
     testImplementation "androidx.room:room-testing:${roomVersion}"
-    implementation 'androidx.preference:preference:1.1.0-alpha01'
+    implementation 'androidx.preference:preference:1.1.0-beta01'
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 
     // KTX

app/src/main/java/org/fossasia/openevent/general/settings/SettingsFragment.kt

@@ -60,20 +60,21 @@ class SettingsFragment : PreferenceFragmentCompat(), PreferenceChangeListener {
         setHasOptionsMenu(true)
 
         // Set Email
-        preferenceScreen.findPreference(getString(R.string.key_account))
-            .summary = if (safeArgs.email.isNullOrEmpty()) getString(R.string.not_logged_in) else safeArgs.email
+        preferenceScreen.findPreference<Preference>(getString(R.string.key_account))?.summary =
+            if (safeArgs.email.isNullOrEmpty()) getString(R.string.not_logged_in) else safeArgs.email
 
         // Set Build Version
-        preferenceScreen.findPreference(getString(R.string.key_version))
-            .title = "Version " + BuildConfig.VERSION_NAME
+        preferenceScreen.findPreference<Preference>(getString(R.string.key_version))?.title =
+            "Version " + BuildConfig.VERSION_NAME
 
-        preferenceScreen.findPreference(getString(R.string.key_timezone_switch))
-            .setDefaultValue(timeZonePreference.getBoolean("useEventTimeZone", false))
+        preferenceScreen.findPreference<Preference>(getString(R.string.key_timezone_switch))?.setDefaultValue(
+            timeZonePreference.getBoolean("useEventTimeZone", false)
+        )
 
-        preferenceScreen.findPreference(getString(R.string.key_profile)).isVisible = profileViewModel.isLoggedIn()
-        preferenceScreen.findPreference(getString(R.string.key_change_password)).isVisible =
+        preferenceScreen.findPreference<Preference>(getString(R.string.key_profile))?.isVisible = profileViewModel.isLoggedIn()
+        preferenceScreen.findPreference<Preference>(getString(R.string.key_change_password))?.isVisible =
             profileViewModel.isLoggedIn()
-        preferenceScreen.findPreference(getString(R.string.key_timezone_switch)).isVisible =
+        preferenceScreen.findPreference<Preference>(getString(R.string.key_timezone_switch))?.isVisible =
             profileViewModel.isLoggedIn()
     }