module: validate module.prop before writing description

Restore module.prop from module.prop.bak if the id field is missing to prevent
broken module metadata.

Author: rifsxd

module/module.prop.bak

@@ -0,0 +1,8 @@
+id=KPatch-Next
+name=KPatch-Next
+version=v0.0.1
+versionCode=1
+author=rifsxd, KOWX712
+description=Standalone implementation of KPM support for Magisk/KernelSU
+updateJson=https://raw.githubusercontent.com/KernelSU-Next/KPatch-Next-Module/main/update.json
+banner=banner.png

module/status.sh

@@ -5,6 +5,9 @@ KPNDIR="/data/adb/kp-next"
 PATH="$MODDIR/bin:$PATH"
 key="$1"
 
+PROP_FILE="$MODDIR/module.prop"
+PROP_BAK="$MODDIR/module.prop.bak"
+
 set_prop() {
     local prop="$1"
     local value="$2"
@@ -19,6 +22,14 @@ set_prop() {
     rm -f "$file.tmp"
 }
 
+restore_prop_if_needed() {
+    if ! grep -q "^id=" "$PROP_FILE"; then
+        if [ -f "$PROP_BAK" ]; then
+            cp "$PROP_BAK" "$PROP_FILE"
+        fi
+    fi
+}
+
 active="Status: active 😊"
 inactive="Status: inactive 😕"
 info="info: key incorrect, not set or kernel not patched yet ❌"
@@ -36,4 +47,6 @@ if [ -n "$key" ] && kpatch "$key" hello >/dev/null 2>&1; then
     string="$active | kpmodule: $KPM_COUNT 💉"
 fi
 
-set_prop "description" "$string" "$MODDIR/module.prop"
+restore_prop_if_needed
+
+set_prop "description" "$string" "$PROP_FILE"