Merge branch 'bugfix/KASM-5524_watermark_rotation_negative_number' into 'master'

KASM-5524 negative numbers on text rotation watermark

Closes KASM-5524

See merge request kasm-technologies/internal/KasmVNC!123

unix/vncserver

@@ -1871,7 +1871,7 @@ sub DefineConfigToCLIConversion {
               isValidCallback => sub {
                 my $value = shift;
 
-                return 0 unless $value =~ /^\d+$/;
+                return 0 unless $value =~ /^-?\d+$/;
 
                 $value >= -359 && $value <= 359;
               },