Fix RTL menu position for icon app chip.

Changed the gravity of the task menu layout parameters from `START` to `LEFT` because `sTempRect.left` measures left distance, not start distance. This ensures correct positioning, particularly in Right-to-Left (RTL) layouts where `START` may align to the left instead of right, according to search result.

Fix: 400867857
Flag: EXEMPT BUG_FIX
Test: Manual. Using RTL and app chip, expands the app chip menu.
Change-Id: Ia3165563c2f87cf7f2d17eee554386d96f30860b