Cleanup filter

app/src/main/java/com/hippo/ehviewer/dao/Filter.kt

@@ -7,10 +7,10 @@ import androidx.room.PrimaryKey
 @Entity(tableName = "FILTER")
 data class Filter(
     @ColumnInfo(name = "MODE")
-    var mode: Int = 0,
+    val mode: Int,
 
     @ColumnInfo(name = "TEXT")
-    var text: String = "INVALID",
+    var text: String,
 
     @ColumnInfo(name = "ENABLE")
     var enable: Boolean = true,

app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryCommentsScene.kt

@@ -304,9 +304,7 @@ class GalleryCommentsScene : BaseToolbarScene(), View.OnClickListener, OnRefresh
         BaseDialogBuilder(context)
             .setMessage(getString(R.string.filter_the_commenter, commenter))
             .setPositiveButton(android.R.string.ok) { _: DialogInterface?, _: Int ->
-                val filter = Filter()
-                filter.mode = EhFilter.MODE_COMMENTER
-                filter.text = commenter
+                val filter = Filter(EhFilter.MODE_COMMENTER, commenter)
                 EhFilter.addFilter(filter)
                 hideComment(position)
                 showTip(R.string.filter_added, LENGTH_SHORT)

app/src/main/java/com/hippo/ehviewer/ui/scene/GalleryDetailScene.kt

@@ -1232,9 +1232,7 @@ class GalleryDetailScene : BaseScene(), DownloadInfoListener {
         BaseDialogBuilder(context)
             .setMessage(getString(R.string.filter_the_tag, tag))
             .setPositiveButton(android.R.string.ok) { _: DialogInterface?, _: Int ->
-                val filter = Filter()
-                filter.mode = EhFilter.MODE_TAG
-                filter.text = tag
+                val filter = Filter(EhFilter.MODE_TAG, tag)
                 EhFilter.addFilter(filter)
                 showTip(R.string.filter_added, LENGTH_SHORT)
             }
@@ -1341,9 +1339,7 @@ class GalleryDetailScene : BaseScene(), DownloadInfoListener {
         BaseDialogBuilder(context)
             .setMessage(getString(R.string.filter_the_uploader, uploader))
             .setPositiveButton(android.R.string.ok) { _: DialogInterface?, _: Int ->
-                val filter = Filter()
-                filter.mode = EhFilter.MODE_UPLOADER
-                filter.text = uploader
+                val filter = Filter(EhFilter.MODE_UPLOADER, uploader)
                 EhFilter.addFilter(filter)
                 showTip(R.string.filter_added, LENGTH_SHORT)
             }