Ensure the version history can fit the widest date format

The version history dropbox is generally the right size. There are some cases, however, where the data wraps to a new line, which makes the versions harder to read, and looks unprofessional. E.g., `2020-12-31 12:00:00 AM`. This is especially an issue because a recent update to the database allows compressing all versions between a range; in that case, they will default to `12:00:00 AM`—and, if done for the entire year, `12-31` of that year. That almost always forces the wrapping.

This fixes that issue, while also cleaning up the styles a bit, as there were some unnecessary styles declared inline in the `_Toolbar.cshtml` template.

Author: JeremyCaney

OnTopic.Editor.AspNetCore/Areas/Editor/Views/Shared/_Toolbar.cshtml

@@ -17,7 +17,7 @@
           Versions
           <span class="caret"></span>
         </button>
-        <ul class="dropdown-menu" role="menu" aria-labelledby="VersionsButton" style="left: 3px; top: 98%;">
+        <ul class="dropdown-menu" role="menu" aria-labelledby="VersionsButton">
           @foreach (DateTime version in Model.Topic.VersionHistory) {
             <li role="presentation" class="small">
               <a tabindex="-1" role="menuitem" href="@Url.Action("SetVersion", "Editor", new { path=Model.Topic.WebPath, version=version.ToString("MM/dd/yyyy hh:mm:ss.fff tt"), isModal=Model.IsModal })">@version.ToString()</a>

OnTopic.Editor.AspNetCore/Shared/Styles/Layout/_layout.scss

@@ -78,6 +78,7 @@ body {
 //----------------------------------------------------------------------------------------------
 .dropdown-menu {
   padding                       : 10px;
+  min-width                     : 180px;
   li a {
     line-height                 : 1.4rem;
   }