Delete and ignore rider's `misc.xml`

This file has changed on us too many times. Doesn't seem to contain
anything of value.

.gitignore

@@ -340,3 +340,5 @@ inspectcode
 # Fody (pulled in by Realm) - schema file
 FodyWeavers.xsd
 **/FodyWeavers.xml
+
+.idea/.idea.osu.Desktop/.idea/misc.xml

.idea/.idea.osu.Desktop/.idea/misc.xml

@@ -1,11 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="SwUserDefinedSpecifications">
-    <option name="specTypeByUrl">
-      <map />
-    </option>
-  </component>
-  <component name="com.jetbrains.rider.android.RiderAndroidMiscFileCreationComponent">
-    <option name="ENSURE_MISC_FILE_EXISTS" value="true" />
-  </component>
-</project>