fix(ft8): unify osmdroid version to fix duplicate classes

CI build failed at :app:checkReleaseDuplicateClasses: local
osmdroid-android-6.1.14.aar (copied from FT8CN) clashed with the
project's osmdroid 6.1.20 (feature/map remote dependency). Switched
feature/ft8 to libs.other.osmdroid (6.1.20), removed the local aar.
Verified: compileDebugJavaWithJavac + :app:compileDebugKotlin
BUILD SUCCESSFUL.

feature/ft8/build.gradle.kts

@@ -41,5 +41,5 @@ dependencies {
     implementation(files("libs/MPAndroidChartv_3.1.0.jar"))
     implementation(files("libs/commons-net-3.6.jar"))
     implementation(files("libs/nanohttpd-2.2.0.jar"))
-    implementation(files("libs/osmdroid-android-6.1.14.aar"))
+    implementation(libs.other.osmdroid)
 }