Remove unreachable case from UHyper_Compiler expression_to_hyper

UJSHOP_Parser already replaces single term conjunctions and
disjunctions.

UHyper_Compiler.rb

@@ -9,10 +9,7 @@ module UHyper_Compiler
 
   def expression_to_hyper(precond_expression, axioms)
     case precond_expression[0]
-    when 'and', 'or'
-      if precond_expression.size == 2 then expression_to_hyper(precond_expression[1], axioms)
-      else '(' << precond_expression.drop(1).map! {|exp| expression_to_hyper(exp, axioms)}.join(" #{precond_expression[0]} ") << ')'
-      end
+    when 'and', 'or' then '(' << precond_expression.drop(1).map! {|exp| expression_to_hyper(exp, axioms)}.join(" #{precond_expression[0]} ") << ')'
     when 'not' then (term = expression_to_hyper(precond_expression[1], axioms)).delete_prefix!('not ') or 'not ' << term
     when 'call' then call(precond_expression)
     when 'assign' then '(_' << precond_expression[1].delete_prefix('?') << ' = ' << evaluate(precond_expression[2]) << ')'