fix: show profile picture in share sheet

Shows the profile picture of the shared account in the share sheet. This
was already done upstream and intended here, but was bugged due to an
additional file provider.

mastodon/src/main/AndroidManifest.xml

@@ -105,16 +105,6 @@
 			</intent-filter>
 		</receiver>
 
-		<provider
-			android:name="org.joinmastodon.android.utils.FileProvider"
-			android:authorities="${applicationId}.fileprovider"
-			android:exported="false"
-			android:grantUriPermissions="true">
-			<meta-data
-				android:name="android.support.FILE_PROVIDER_PATHS"
-				android:resource="@xml/file_paths" />
-		</provider>
-
 		<provider
 			android:authorities="${applicationId}.fileprovider"
 			android:name=".TweakedFileProvider"

mastodon/src/main/java/org/joinmastodon/android/ui/utils/UiUtils.java

@@ -1769,9 +1769,9 @@ public class UiUtils {
 		ImageCache cache=ImageCache.getInstance(context);
 		try{
 			File ava=cache.getFile(new UrlImageLoaderRequest(account.avatarStatic));
-			if(!ava.exists())
+			if(ava==null || !ava.exists())
 				ava=cache.getFile(new UrlImageLoaderRequest(account.avatar));
-			if(ava.exists()){
+			if(ava!=null && ava.exists()){
 				intent.setClipData(ClipData.newRawUri(null, getFileProviderUri(context, ava)));
 				intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
 			}