[Q] removing stock apps correctly (busybox and terminal emulator) topic

Alright, so checking up the system folder with root explorer I noticed that there are several applications related to the stock music player.
I can't just simply remove these "apks", right? Pretty certain there'd be leftovers of this app somewhere.
So, I realize, there's no "uninstall" script for the music app, but I was wondering, what is the most correct way to delete music application?
Simple doing this won't cut it, right?

Code:

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su
cd system/app
mount -o rw,remount /system
rm -r MusicCommonUtility
rm -rMusicLiveShare2.apk
rm -rMusicPlayerWT.apk
mount -o remount,ro /system

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[Q] 90° Vertical is not aligned correctly, Sensor Calibration issue topic

When I hold my phone vertical (portrait or landscape) to take panorama or photosphere photos it's out of alignment and I have to downward it to the earth to adjust the horizon line to the middle of screen. In another word if I hold my phone in 80° its sensor behave like it is in 90°. Attached photos shows the problem. I have rooted my device with official 4.4.2. I couldn't find any helpful guide about how to initialize or calibrate accelerometer or G-Sensor. rotating phone in 8 path, rotating around all 3 axises, restarting device didn't help.
Please help me how to solve this issue. I don't want to reset factory device right know. I've access to all system files if needed. Thanks

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