Revert "build: use split apks"

Honestly, changing the version code schema is far too much of a hassle
for these to be reasonable.

This reverts commit 055d25e3e1.

.github/workflows/android.yml

@@ -31,4 +31,4 @@ jobs:
       uses: actions/upload-artifact@v3.1.1
       with:
         name: Auxio_Canary
-        path: ./app/build/outputs/apk/debug/*.apk
+        path: ./app/build/outputs/apk/debug/app-debug.apk

app/build.gradle

@@ -57,15 +57,6 @@ android {
         }
     }
 
-    splits {
-        abi {
-            enable true
-            reset()
-            include "x86", "x86_64", "arm64-v8a", "armeabi-v7a"
-            universalApk true
-        }
-    }
-
     buildFeatures {
         viewBinding true
     }