Drop all non-customised options

abra.sh

@@ -1 +1 @@
-export APP_INI_VERSION=v4
+export APP_INI_VERSION=v5

app.ini.tmpl

@@ -1,9 +1,6 @@
 APP_NAME = {{ env "GITEA_APP_NAME" }}
-RUN_MODE = prod
-RUN_USER = git
 
 [database]
-CHARSET = utf8mb4
 DB_TYPE = {{ env "GITEA_DB_TYPE" }}
 HOST = {{ env "GITEA_DB_HOST" }}
 NAME = {{ env "GITEA_DB_NAME" }}