chore: replace textDrawable library (#136)

## Types of changes

- [x] I have read the **CONTRIBUTING** document.
- [x] My code follows the code style of this project.
- [ ] I have updated the documentation accordingly.
- [ ] I have added tests to cover my changes.
- [x] All new and existing tests passed.
- [x] This is **NOT** translation related.

This closes issue #120

Removed the dependency `com.amulyakhare.textdrawable` and slightly simplified the logic required to set circular images.

Co-authored-by: davidoskky <davidoskky@yahoo.it>
Reviewed-on: https://gitea.amine-louveau.fr/Louvorg/ReaderForSelfoss-multiplatform/pulls/136
Co-authored-by: davidoskky <davidoskky@hidden.hidden>
Co-committed-by: davidoskky <davidoskky@hidden.hidden>

androidApp/src/main/res/values/styles.xml

@@ -32,4 +32,10 @@
         <item name="android:colorBackgroundCacheHint">@null</item>
         <item name="android:windowIsTranslucent">true</item>
     </style>
+
+    <style name="circleImageView" parent="">
+        <item name="cornerFamily">rounded</item>
+        <item name="cornerSize">50%</item>
+    </style>
+
 </resources>