Fixed: Allow sixel DCS command start P3 arg to not end with a semicolon

Author: agnostic-apollo

terminal-emulator/src/main/java/com/termux/terminal/TerminalEmulator.java

@@ -1400,6 +1400,12 @@ private int[] getSixelDcsSetupArgs(String dcs, int index) {
                 }
 
                 incArg = true;
+            } else if (ch == 'q') {
+                // If `P3` did not end with a `;`, but is followed by `q`.
+                if (arg == 2) {
+                    return args;
+                }
+                break;
             } else {
                 break;
             }