Fix detekt findings

Signed-off-by: Alper Ozturk <alperozturk@lions-macbook.local>
Signed-off-by: alperozturk <alper_ozturk@proton.me>

app/src/main/java/com/nextcloud/utils/extensions/DisplayMetricsExtensions.kt

@@ -4,4 +4,4 @@ import android.util.DisplayMetrics
 
 fun DisplayMetrics.isLowDensityScreen(): Boolean {
     return this.density < 2
-}
+}

app/src/main/java/com/nextcloud/utils/extensions/LayerDrawableExtensions.kt

@@ -7,4 +7,4 @@ fun LayerDrawable.setLayerSizeWithInsetTop(index: Int, size: Int, margin: Int) {
         setLayerSize(index, size, size)
         setLayerInsetTop(index, margin)
     }
-}
+}

app/src/main/java/com/owncloud/android/ui/adapter/GroupfolderListAdapter.kt

@@ -51,10 +51,8 @@ class GroupfolderListAdapter(
     }
 
     private fun getFolderIcon(): LayerDrawable? {
-        val folderDrawable = MimeTypeUtil.getDefaultFolderIcon(context, viewThemeUtils) ?: return null
-        val overlayDrawable = ContextCompat.getDrawable(context, R.drawable.ic_folder_overlay_account_group) ?: return null
-        val drawableUtil = DrawableUtil()
-        return drawableUtil.addDrawableAsOverlay(context, folderDrawable, overlayDrawable)
+        val overlayDrawableId = R.drawable.ic_folder_overlay_account_group
+        return MimeTypeUtil.getFileIcon(false, overlayDrawableId, context, viewThemeUtils)
     }
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {

app/src/main/java/com/owncloud/android/utils/DrawableUtil.kt

@@ -19,8 +19,11 @@ class DrawableUtil {
     fun addDrawableAsOverlay(context: Context, backgroundDrawable: Drawable, overlayDrawable: Drawable): LayerDrawable {
         val isLowDensityScreen = context.resources.displayMetrics.isLowDensityScreen()
 
-        val overlayIconSize = if (isLowDensityScreen) { 12 } else { 24 }
-        val overlayIconTopMargin = if (isLowDensityScreen) { 3 } else { 6 }
+        val defaultIconSize = 24
+        val defaultIconTopMargin = 6
+
+        val overlayIconSize = if (isLowDensityScreen) { defaultIconSize / 2 } else { defaultIconSize }
+        val overlayIconTopMargin = if (isLowDensityScreen) { defaultIconTopMargin / 2 } else { defaultIconTopMargin }
 
         val layerDrawable = LayerDrawable(arrayOf(backgroundDrawable, overlayDrawable))
         layerDrawable.setLayerSizeWithInsetTop(1, overlayIconSize, overlayIconTopMargin)
@@ -28,4 +31,4 @@ class DrawableUtil {
 
         return layerDrawable
     }
-}
+}