Show a close button for hashtag tab chips (#3140)

The intent of the previous code seems to be to show an "X" icon on a hashtag
chip when two or more chips are present.

This didn't work because the icon was not set as visible.

Fix this. In addition, set this as a "cancel" icon, not the chip's regular
icon, so it appears on the right (in LTR locales), as is normal for the
close button on chips.

Tinting the icon did nothing, so remove that.

app/src/main/java/com/keylesspalace/tusky/adapter/TabAdapter.kt

@@ -15,7 +15,6 @@
 
 package com.keylesspalace.tusky.adapter
 
-import android.content.res.ColorStateList
 import android.view.LayoutInflater
 import android.view.MotionEvent
 import android.view.ViewGroup
@@ -23,7 +22,6 @@ import androidx.core.view.size
 import androidx.recyclerview.widget.RecyclerView
 import androidx.viewbinding.ViewBinding
 import com.google.android.material.chip.Chip
-import com.google.android.material.color.MaterialColors
 import com.keylesspalace.tusky.HASHTAG
 import com.keylesspalace.tusky.LIST
 import com.keylesspalace.tusky.R
@@ -120,17 +118,18 @@ class TabAdapter(
 
                     val chip = binding.chipGroup.getChildAt(i).takeUnless { it.id == R.id.actionChip } as Chip?
                         ?: Chip(context).apply {
+                            setCloseIconResource(R.drawable.ic_cancel_24dp)
+                            isCheckable = false
                             binding.chipGroup.addView(this, binding.chipGroup.size - 1)
-                            chipIconTint = ColorStateList.valueOf(MaterialColors.getColor(this, android.R.attr.textColorPrimary))
                         }
 
                     chip.text = arg
 
                     if (tab.arguments.size <= 1) {
-                        chip.chipIcon = null
+                        chip.isCloseIconVisible = false
                         chip.setOnClickListener(null)
                     } else {
-                        chip.setChipIconResource(R.drawable.ic_cancel_24dp)
+                        chip.isCloseIconVisible = true
                         chip.setOnClickListener {
                             listener.onChipClicked(tab, holder.bindingAdapterPosition, i)
                         }