Framework: Move locale param expectations inline

Without freeze, can’t be certain that the original instance wasn’t
modified

client/lib/wp/localization/test/index.js

@@ -37,18 +37,16 @@ describe( 'localization', () => {
 
 	describe( '#addLocaleQueryParam()', () => {
 		it( 'should not modify params if locale unknown', () => {
-			const original = { query: 'search=foo' };
-			const params = addLocaleQueryParam( original );
+			const params = addLocaleQueryParam( { query: 'search=foo' } );
 
-			expect( params ).to.eql( original );
+			expect( params ).to.eql( { query: 'search=foo' } );
 		} );
 
 		it( 'should not modify params if locale is default', () => {
 			localization.__set__( 'locale', 'en' );
-			const original = { query: 'search=foo' };
-			const params = addLocaleQueryParam( original );
+			const params = addLocaleQueryParam( { query: 'search=foo' } );
 
-			expect( params ).to.eql( original );
+			expect( params ).to.eql( { query: 'search=foo' } );
 		} );
 
 		it( 'should include the locale query parameter for a non-default locale', () => {