Revert "Update MAXS Main to 0.5.7-SNAPSHOT (2000501598)"

There is no 0.5.7-SNAPSHOT tag.

This reverts commit b8c30bffca.

metadata/org.projectmaxs.main.yml

@@ -249,16 +249,6 @@ Builds:
       - make prebuild
       - rm -rf ../module-shell/libraryProjects/root-commands/ExampleApp
 
-  - versionName: 0.5.7-SNAPSHOT
-    versionCode: 2000501598
-    commit: 0.5.7-SNAPSHOT
-    subdir: main
-    submodules: true
-    sudo: apt-get install -y python-gnupg libxml2-utils
-    prebuild:
-      - make prebuild
-      - rm -rf ../module-shell/libraryProjects/root-commands/ExampleApp
-
 AutoUpdateMode: Version %v
 UpdateCheckMode: Tags
 CurrentVersion: 0.5.5