Fix ATIS messages silently dropped when containing placeholder lines

[Copilot]

Fixes #359. VATSIM ATIS messages containing placeholder lines (e.g., "z", "z1", "z2") were silently dropped and never displayed to users.

Root Cause

In updateAtisMap(), three return statements inside a for loop exit the entire function when a placeholder line is encountered, preventing the atisReplyReceived signal from being emitted:

// Before: exits function, drops entire ATIS
if (test == "z") return;
if (test.startsWith("z") && test.length() == 2) return;
if (test.length() == 1) return;

Fix

Changed return to continue to skip placeholder lines while still processing remaining content:

// After: skips line, continues processing
if (test == "z") continue;
if (test.startsWith("z") && test.length() == 2) continue;
if (test.length() == 1) continue;

Original prompt

Investigate the reason for issue 359

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