Revert "Fix Find Mixins TW not showing up"

This reverts commit 14b015e.

For some reason Jetbrains hasn't backported a fix that's plaguing
 facet-dependent TWs on 2023.1 yet, so let's revert this commit for 2023.1 only

src/main/kotlin/platform/mixin/action/FindMixinsAction.kt

@@ -52,6 +52,10 @@ class FindMixinsAction : AnAction() {
     class TWFactory : ToolWindowFactory {
         override fun createToolWindowContent(project: Project, toolWindow: ToolWindow) {
         }
+
+        override fun shouldBeAvailable(project: Project): Boolean {
+            return false
+        }
     }
 
     companion object {

src/main/resources/META-INF/plugin.xml

@@ -426,10 +426,8 @@
                                order="before javaSkipAutopopupInStrings"/>
         <weigher key="completion" implementationClass="com.demonwav.mcdev.platform.mixin.completion.MixinCompletionWeigher" id="mcdev.mixin" order="first"/>
 
-        <facet.toolWindow anchor="bottom" icon="/assets/icons/mixin/mixin_class_gutter.png" canCloseContents="true"
-                          doNotActivateOnStart="true" facetIdList="minecraft" showOnStripeByDefault="false"
-                          factoryClass="com.demonwav.mcdev.platform.mixin.action.FindMixinsAction$TWFactory"
-                          id="Find Mixins"/>
+        <toolWindow anchor="bottom" icon="/assets/icons/mixin/mixin_class_gutter.png" canCloseContents="true" doNotActivateOnStart="true"
+                    factoryClass="com.demonwav.mcdev.platform.mixin.action.FindMixinsAction$TWFactory" id="Find Mixins" />
 
         <!-- Mixin configuration -->
         <fileType name="Mixin Configuration" language="JSON" implementationClass="com.demonwav.mcdev.platform.mixin.config.MixinConfigFileType" fieldName="INSTANCE" />