Nextcloud SMS: remove erroneously added build

metadata/fr.unix_experience.owncloud_sms.yml

@@ -398,19 +398,6 @@ Builds:
       - gradle
     prebuild: sed -i -e '/jcenter()/a\        google()' build.gradle
 
-  - versionName: 2.0.6
-    versionCode: 70
-    commit: 2.0.6
-    gradle:
-      - yes
-    rm:
-      - gradle
-    prebuild: sed -i -e '/jcenter()/a\        google()' build.gradle
-
-MaintainerNotes: |-
-    distributionUrl specifies Gradle 3.3, while Android Gradle plugin 3.0.0
-    requires Gradle 4.1 or later.
-
 AutoUpdateMode: Version %v
 UpdateCheckMode: Tags
 CurrentVersion: 2.0.5