[GTK] Refactor js_bridge check
[GTK] Refactor js_bridge check

r0x0r/pywebview,r0x0r/pywebview,shivaprsdv/pywebview,r0x0r/pywebview,r0x0r/pywebview,r0x0r/pywebview,shivaprsdv/pywebview,shivaprsdv/pywebview,shivaprsdv/pywebview