Fix f-droid can't build new app version.

F-Droid has a strict limitation (😞) that version code and
version name should be in the app build.gradle.

Signed-off-by: Yahor Berdnikau <egorr.berd@gmail.com>

dependencies.gradle

@@ -1,7 +1,4 @@
 ext.versions = [
-        versionCode          : 67,
-        versionName          : "2.4.0",
-
         minSdk               : 14,
         targetSdk            : 22,
         compileSdk           : 27,

ultrasonic/build.gradle

@@ -8,8 +8,8 @@ android {
 
     defaultConfig {
         applicationId "org.moire.ultrasonic"
-        versionCode versions.versionCode
-        versionName versions.versionName
+        versionCode 67
+        versionName "2.4.0"
 
         minSdkVersion versions.minSdk
         targetSdkVersion versions.targetSdk