Fix typo space in test

Author: mattmilburn

admin/src/utils/__tests__/trim-slashes.spec.js

@@ -5,7 +5,7 @@ describe('trimSlashes', () => {
     const input1 = '/foo/bar/';
     const input2 = '/foo/bar';
     const input3 = 'foo/bar/';
-    const output = ` foo/bar`;
+    const output = 'foo/bar';
     const result1 = trimSlashes(input1);
     const result2 = trimSlashes(input2);
     const result3 = trimSlashes(input3);