Fix broken import previews

All three were inadvertently showing the existing tiddler (if any), not the imported tiddler.

core/ui/ImportPreviews/Fields.tid

@@ -2,6 +2,17 @@ title: $:/core/ui/ImportPreviews/Fields
 tags: $:/tags/ImportPreview
 caption: {{$:/language/Import/Listing/Preview/Fields}}
 
-<$tiddler tiddler=<<payloadTiddler>>>
-<$transclude tiddler="$:/core/ui/TiddlerFields"/>
-</$tiddler>
+<table class="tc-view-field-table">
+<tbody>
+<$list filter="[<payloadTiddler>subtiddlerfields<currentTiddler>sort[]] -text" variable="fieldName">
+<tr class="tc-view-field">
+<td class="tc-view-field-name">
+<$text text=<<fieldName>>/>
+</td>
+<td class="tc-view-field-value">
+<$view field=<<fieldName>> tiddler=<<currentTiddler>> subtiddler=<<payloadTiddler>>/>
+</td>
+</tr>
+</$list>
+</tbody>
+</table>

core/ui/ImportPreviews/Text.tid

@@ -2,4 +2,4 @@ title: $:/core/ui/ImportPreviews/Text
 tags: $:/tags/ImportPreview
 caption: {{$:/language/Import/Listing/Preview/Text}}
 
-<$transclude tiddler=<<payloadTiddler>> mode="block"/>
+<$transclude tiddler=<<currentTiddler>> subtiddler=<<payloadTiddler>> mode="block"/>

core/ui/ImportPreviews/TextRaw.tid

@@ -2,4 +2,4 @@ title: $:/core/ui/ImportPreviews/TextRaw
 tags: $:/tags/ImportPreview
 caption: {{$:/language/Import/Listing/Preview/TextRaw}}
 
-<pre><code><$view tiddler=<<payloadTiddler>>/></code></pre>
+<pre><code><$view tiddler=<<currentTiddler>> subtiddler=<<payloadTiddler>> /></code></pre>