fix(scopes): Use locale for hour scope, not minute scope

Minutes will be the same for all locales.
Hours can difer (AM/PM, 24h format, ...)

src/scope/hour-scope.ts

@@ -21,7 +21,7 @@ export class HourScope extends AbstractScope {
     return hours;
   }
 
-  public formatDate(date: Date): string {
+  public formatDate(date: Date, locale?: any): string {
     return formatDate(date, 'HH');
   }
 

src/scope/minute-scope.ts

@@ -22,7 +22,7 @@ export class MinuteScope extends AbstractScope {
     return minutes;
   }
 
-  public formatDate(date: Date, locale?: any): string {
+  public formatDate(date: Date): string {
     return formatDate(date, 'mm');
   }
 

test/scope/minute-scope.spec.ts

@@ -33,13 +33,6 @@ describe('MinuteScope', () => {
     expect(result).toBe('59');
   });
 
-  it('formatDate should respect locale', () => {
-    const locale = undefined;
-    const result = scope.formatDate(date, locale);
-    expect(result).toBe('59');
-  });
-
-
   it('title should return year', () => {
     const result = scope.title(date);
     expect(result).toBe('24. 04. 2018');