Enhancement：Provides zoom in Live logcat mode

[Shawnli3287]

Recently I analyzed your software's reviews on google play. In the LDA analysis of reviews, I found a small topic about the lack of zoom-in function in live logcat mode. Although only one user's review is about the zoom-in function, if it can meet the needs of various users, it will undoubtedly increase the competitiveness of Syslog. Original review: "Live logcat way too small"

[RokeJulianLockhart]

https://github.com/Tortel/SysLog/issues/30#issue-1194026023

@Shawnli3287, surely merely adhering to the system font (size) preference is superior? No alternative text field provides zoom functionality - that's more the purview of an accessibility toolset.