Update MeasurementsDisplay and QueryBoolean types to be more readable

Specifying the values again make them more readable as suggested
in review

<#1910 (comment)>

src/actions/measurements.ts

@@ -37,8 +37,8 @@ interface GroupingValues {
 const filterQueryPrefix = "mf_";
 type MeasurementsFilterQuery = `mf_${string}`
 
-const queryBooleanValues = ["show", "hide"] as const;
-type QueryBoolean = (typeof queryBooleanValues)[number]
+type QueryBoolean = "show" | "hide"
+const queryBooleanValues: QueryBoolean[] = ["show", "hide"];
 export const isQueryBoolean = (x: any): x is QueryBoolean => queryBooleanValues.includes(x)
 /* Measurements query parameters that are constructed and/or parsed here. */
 interface MeasurementsQuery {

src/reducers/measurements/types.ts

@@ -1,8 +1,8 @@
 import { measurementIdSymbol } from "../../util/globals";
 
 // -- Shared Measurements types -- //
-export const measurementsDisplayValues = ["raw", "mean"];
-export type MeasurementsDisplay = (typeof measurementsDisplayValues)[number]
+export type MeasurementsDisplay = "raw" | "mean"
+export const measurementsDisplayValues: MeasurementsDisplay[] = ["raw", "mean"];
 export const isMeasurementsDisplay = (x: any): x is MeasurementsDisplay => measurementsDisplayValues.includes(x);
 
 // -- Measurements JSON types -- //