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Fixes position of red rectangle on top of zbar codes and fixes screen area where touch activates zbar's data-related menu

Administrator requested to merge zbar-code-red-area into master

Fixes position of red rectangle on top of zbar codes and fixes screen area where touch activates zbar's data-related menu

Fixes issue #50

Tests done on my PP 3GB with Megapixels 1.5.2 on Mobian bookworm with Phosh:

PP in portrait position

preview 360x640

size 720x1280

scale 2.0

tappable area roughly x=0-360 y=50-580

top bar height 44px , bottom bar height 72px

(preview height - bars' height = 640 - 44 - 72 = 524 approx.= 530 = y_range)

no bar on left/right, then zbar_x=x

zbar_y is corrected for top bar's height

PP in landscape position

preview 640x360

size 1024x576

scale 1.6

tappable area roughly x=40-660 y=0-285

bars both on left and right side, zbar_x is adjusted according to left bar width

zbar_y=y mapping is not perfect, active area is moved a bit down with respect to red preview area, but this MR is anyway a huge improvement over actual situation

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