Revert "add calculation to piechart"

This reverts commit cd6e479.

Author: coleenquadros

piechart/sdk/go/options.go

@@ -15,13 +15,6 @@ package pie
 
 import "github.com/perses/perses/go-sdk/common"
 
-func Calculation(calculation common.Calculation) Option {
-	return func(builder *Builder) error {
-		builder.Calculation = calculation
-		return nil
-	}
-}
-
 func WithLegend(legend Legend) Option {
 	return func(builder *Builder) error {
 		builder.Legend = &legend

piechart/sdk/go/pie.go

@@ -136,11 +136,7 @@ func create(options ...Option) (Builder, error) {
 		PluginSpec: PluginSpec{},
 	}
 
-	defaults := []Option{
-		Calculation(common.LastCalculation),
-	}
-
-	for _, opt := range append(defaults, options...) {
+	for _, opt := range options {
 		if err := opt(builder); err != nil {
 			return *builder, err
 		}