set equalizer to enabled only if it is disabled

app/src/main/kotlin/com/simplemobiletools/musicplayer/activities/EqualizerActivity.kt

@@ -42,7 +42,9 @@ class EqualizerActivity : SimpleActivity() {
         val player = MusicService.mPlayer ?: MediaPlayer()
         val equalizer = MusicService.mEqualizer ?: Equalizer(0, player.audioSessionId)
         try {
-            equalizer.enabled = true
+            if (!equalizer.enabled) {
+                equalizer.enabled = true
+            }
         } catch (e: IllegalStateException) {
         }
 

app/src/main/kotlin/com/simplemobiletools/musicplayer/services/MusicService.kt

@@ -353,7 +353,10 @@ class MusicService : Service(), MediaPlayer.OnPreparedListener, MediaPlayer.OnEr
         try {
             val preset = config.equalizerPreset
             mEqualizer = Equalizer(0, mPlayer!!.audioSessionId)
-            mEqualizer!!.enabled = true
+            if (!mEqualizer!!.enabled) {
+                mEqualizer!!.enabled = true
+            }
+
             if (preset != EQUALIZER_PRESET_CUSTOM) {
                 mEqualizer!!.usePreset(preset.toShort())
             } else {