Clean InputMethodPreference icon logic

This is a follow up CL as CL[1] which prevent
a crash for TvSettings. Use same LayoutParams
for non-TV cases to avoid special code path.

[1]: I7e59f0a2c3fefe7e2c45e136f74d96416f159880

Bug: 205671514
Test: Manual test the icon size
Change-Id: I3bbc01bc0a8cde1805d8996feba60ee3f5f5b399