manifest: Lock the screen orientation at portrait

Author: libxzr

app/src/main/AndroidManifest.xml

@@ -8,7 +8,9 @@
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/Theme.HorizonKernelFlasher">
-        <activity android:name=".MainActivity">
+        <activity
+            android:name=".MainActivity"
+            android:screenOrientation="portrait">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />