fix(sql): fix bad rewrite of limit -N

[bziobrowski]

Fixes
at least one aggregation function must be present in 'select' clause
error triggered by bad rewrite of limit -N clause .

Example (using demo):

select  timestamp, count(*) as total 
from trades 
sample by 1s 
limit -10

[ideoma]

[PR Coverage check]

😍 pass : 14 / 15 (93.33%)

file detail

	path	covered line	new line	coverage
🔵	io/questdb/griffin/SqlOptimiser.java	14	15	93.33%