Don't trim gallery detail cache, Resolve #710

It will only free about 1 MB memory

app/src/main/kotlin/com/hippo/ehviewer/EhApplication.kt

@@ -17,7 +17,6 @@
 package com.hippo.ehviewer
 
 import android.app.Application
-import android.content.ComponentCallbacks2
 import android.content.Context
 import android.os.StrictMode
 import androidx.appcompat.app.AppCompatDelegate
@@ -175,14 +174,6 @@ class EhApplication : Application(), SingletonImageLoader.Factory {
         }
     }
 
-    override fun onTrimMemory(level: Int) {
-        super.onTrimMemory(level)
-        if (level >= ComponentCallbacks2.TRIM_MEMORY_RUNNING_LOW) {
-            // Keep one entry for GalleryCommentsScreen
-            galleryDetailCache.trimToSize(1)
-        }
-    }
-
     override fun newImageLoader(context: Context) = context.imageLoader {
         components {
             serviceLoaderEnabled(false)