Unable to detect uppercase "DOCOMO" and lowercase "docomo"

Hello,

The system fails to detect devices listed when the case of "DOCOMO" is different (uppercase vs. lowercase).

I attempted to add the following device to the default list:

```
31,0,docomo,SO-41B,Sony,Xperia Ace II,3982-3985MB,Phone,Mediatek MT6765,Imagination Tech PowerVR GE8320 (680 MHz),720x1496,300,arm64-v8a;armeabi;armeabi-v7a,30;31;33,0%0%0%0%
```
I identified that the issue originates from a case-sensitive check in vkquality_matching.cpp:

```C++

if (brand_view == brand && device_view == device) {
```
After modifying the code to perform a case-insensitive comparison, the device was recognized and operated correctly.
```C++

if (to_lower(brand_view) == to_lower(brand) && device_view == device) {
```

Read the case-sensitive brand and device comparison in vkquality_matching.cpp, along with the surrounding matching logic. Update the behavior so the listed device is recognized when the DOCOMO brand casing differs, then verify that the device is detected and operates correctly.

Written by the indexing model from the issue text.