Fix All-apps search box background pixelation

Enable bitmap filter for search box background. This avoids
jagged line, when bitmap is translated by half screen pixel.

Bug: 77841258
Test: Ran launcher on a device
Change-Id: I9293669da5db8be16ebe55ce01ab0e9735932c12

src/com/android/launcher3/graphics/NinePatchDrawHelper.java

@@ -33,7 +33,9 @@ public class NinePatchDrawHelper {
 
     private final Rect mSrc = new Rect();
     private final RectF mDst = new RectF();
-    public final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
+    // Enable filtering to always get a nice edge. This avoids jagged line, when bitmap is
+    // translated by half pixel.
+    public final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
 
     /**
      * Draws the bitmap split into three parts horizontally, with the middle part having width