Fix remaining svelte/no-useless-mustaches errors

The two remaining svelte/no-useless-mustaches errors were auto-fixed by
the eslint rule.

Author: rmunn

frontend/src/routes/(authenticated)/project/create/+page.svelte

@@ -238,7 +238,7 @@
       <ProjectTypeSelect bind:value={$form.type} error={$errors.type} />
 
       <Select id="org" label={$t('project.create.org')} bind:value={$form.orgId} error={$errors.orgId}>
-        <option value={''}>{$t('project_page.organization.placeholder')}</option>
+        <option value="">{$t('project_page.organization.placeholder')}</option>
         {#each myOrgs as org}
           <option value={org.id}>{org.name}</option>
         {/each}

frontend/src/routes/(unauthenticated)/register/+page.svelte

@@ -13,7 +13,7 @@
 
 <TitlePage title={$t('register.title')}>
   <div class="flex flex-col pb-2">
-    <RegisterWithGoogleButton href={`/api/login/google`}/>
+    <RegisterWithGoogleButton href="/api/login/google"/>
   </div>
   <div class="divider lowercase">{$t('common.or')}</div>
   <CreateUser handleSubmit={register} onSubmitted={onSubmit} />