Always disable integer scaling in integer_scaling = auto mode for adaptive CRT shaders when the fallback sharp shader is active.

This fixes a rather obscure bug that manifests when:

• An adaptive CRT shader is selected (glshader = crt-auto-*)
• The default integer_scaling = auto mode is selected
• The fallback sharp shader is active because the minimum vertical scaling ratio requirement hasn't been met
• When the fallback shader activation is triggered first by a screen mode change or a window resize event, the integer scaling is turned off — this is correct ✅
• But if you then press the "Reload Shader" shortcut, or enter/exit fullscreen, the vertical integer scaling will be activated again — this is a bug 🛑