chore: disable layout update animations.

This is to disable animated update
for candidate changes.

(cherry picked from commit 70e4fb3)

app/src/main/java/com/osfans/trime/ime/symbol/LiquidKeyboard.kt

@@ -220,6 +220,8 @@ class LiquidKeyboard(
                 layoutManager = flexboxLayoutManager
                 adapter = varLengthAdapter
                 setItemViewCacheSize(50)
+                // CandidateAdapter现在使用notifyItemRangeChanged，下面禁用layout变化的缺省动画。
+                keyboardView.itemAnimator = null
                 setHasFixedSize(false)
                 isSelected = true
             }