Bugfix/sentinel enable change

In reference to discussion https://gitlab.nic.cz/turris/turris-os-packages/-/merge_requests/416#note_161800 and also once I opened it in editor I tweaked it in few areas.

collect/sentinel/sentinel-proxy/files/sentinel.sh

 #!/bin/sh
 
-
 allowed_to_run() {
-    local component_name="$1";
-    agreed_with_eula "${component_name}" && component_enabled "${component_name}" && return 0
-    return 1
+	local component_name="$1";
+	agreed_with_eula "${component_name}" && component_enabled "${component_name}"
 }
 
 component_enabled() (
-    local component_name="$1";
-    config_load sentinel
-
-    local enabled
-    config_get_bool enabled "${component_name}" enabled "0"
-    [ "$enabled" = "1" ] || {
-        echo "Failed to start - ${component_name} not enabled" >&2
-        return 1
-    }
-    return 0
+	local component_name="$1";
+	config_load sentinel
+
+	local enabled
+	config_get_bool enabled "${component_name}" enabled "1"
+	[ "$enabled" = "1" ] || {
+		echo "Sentinel ${component_name} not enabled" >&2
+		return 1
+	}
 )
 
 agreed_with_eula() (
-    local component_name="$1";
-    config_load sentinel
+	local component_name="$1";
+	config_load sentinel
+
+	local agreed_eula_version
+	config_get agreed_eula_version main agreed_with_eula_version "0"
+	[ "$agreed_eula_version" -le "0" ] || return 0
 
-    local agreed_eula_version
-    config_get agreed_eula_version main agreed_with_eula_version "0"
-    [ "$agreed_eula_version" -le "0" ] && {
-        echo "Failed to start ${component_name} - not agreed with EULA.
+	cat >&2 <<EOF
+Not agreed with EULA.
 
 EULA could be found at /usr/share/sentinel-eula/ and you can
 agree with it either in ReForis data collect tab or using
 uci config:
-$uci set sentinel.main.agreed_with_eula_version=1
+uci set sentinel.main.agreed_with_eula_version=1
 
 EULA version may increase in time. See documentation for more details."
-        return 1
-    }
-    return 0
+EOF
+	return 1
 )