fix(b9efdbbb40): adapt the ComposeFragment's take picture button to that commit

mastodon/src/main/res/xml/file_paths.xml

@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<paths xmlns:android="http://schemas.android.com/apk/res/android">
-    <external-path name="external_files" path="." />
-    <cache-path
-        name="cache"
-        path="."/>
-</paths>

mastodon/src/main/res/xml/fileprovider_paths.xml

@@ -1,4 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <paths>
 	<cache-path name="image_cache" path="images/"/>
+	<cache-path
+		name="pictures_taken_through_compose"
+		path="."/>
 </paths>