add padding to spinner text items

app/src/main/java/im/angry/openeuicc/ui/MainActivity.kt

@@ -45,7 +45,7 @@ class MainActivity : AppCompatActivity() {
 
         manager = openEuiccApplication.euiccChannelManager
 
-        spinnerAdapter = ArrayAdapter<String>(this, android.R.layout.simple_spinner_item)
+        spinnerAdapter = ArrayAdapter<String>(this, R.layout.spinner_item)
 
         lifecycleScope.launch {
             init()

app/src/main/res/layout/spinner_item.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingHorizontal="10dp"
+    android:paddingVertical="8dp"/>