Fixed paragraph span flag

app/src/main/java/eu/faircode/email/HtmlHelper.java

@@ -2570,11 +2570,11 @@ public class HtmlHelper {
                     spans[i] instanceof BulletSpan ||
                     spans[i] instanceof NumberSpan) {
                 if (spans[i] instanceof AlignmentSpan &&
-                        !(e > 1 && ssb.charAt(e - 1) == '\n') &&
+                        !(e > 0 && ssb.charAt(e - 1) == '\n') &&
                         e < ssb.length() && ssb.charAt(e) == '\n')
                     e++;
-                if (s > 1 && ssb.charAt(s - 1) == '\n' &&
+                if (s > 0 && ssb.charAt(s - 1) == '\n' &&
-                        e > 1 && ssb.charAt(e - 1) == '\n')
+                        e > 0 && ssb.charAt(e - 1) == '\n')
                     f |= Spanned.SPAN_PARAGRAPH;
             }
             ssb.setSpan(spans[i], s, e, f);