rime: set _linear by default

[ksqsf]

enable the left key and the right key to select candidates.

[github-actions]

Arch comparison

-	x86_64	arm64	any
anthy	✅	✅	✅
array	❌	❌	✅
bamboo	✅	✅	✅
boshiamy	❌	❌	✅
cangjie	❌	❌	✅
cantonese	❌	❌	✅
chewing	✅	✅	✅
chinese-addons	✅	✅	✅
hallelujah	✅	✅	✅
hangul	✅	✅	✅
lua	✅	✅	✅
quick	❌	❌	✅
rime	✅	✅	✅
sayura	✅	✅	✅
skk	✅	✅	✅
stroke	❌	❌	✅
thai	✅	✅	✅
unikey	✅	✅	✅
wu	❌	❌	✅
wubi86	❌	❌	✅
wubi98	❌	❌	✅
zhengma	❌	❌	✅

22 plugins in total.