[attributedlabel] Always update the line height on the attributed str…

…ing.

This avoids a bug where setting the line height to the same value doesn't cause the line height to be set on the attributed string if it's been changed.

src/attributedlabel/src/NIAttributedLabel.m

@@ -533,14 +533,12 @@ - (void)setLinkColor:(UIColor *)linkColor {
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 - (void)setLineHeight:(CGFloat)lineHeight {
-  if (_lineHeight != lineHeight ) {
-    _lineHeight = lineHeight;
+  _lineHeight = lineHeight;
 
-    if (nil != self.mutableAttributedString) {
-      CTTextAlignment alignment = [self.class alignmentFromUITextAlignment:self.textAlignment];
-      CTLineBreakMode lineBreak = [self.class lineBreakModeFromUILineBreakMode:self.lineBreakMode];
-      [self.mutableAttributedString setTextAlignment:alignment lineBreakMode:lineBreak lineHeight:self.lineHeight];
-    }
+  if (nil != self.mutableAttributedString) {
+    CTTextAlignment alignment = [self.class alignmentFromUITextAlignment:self.textAlignment];
+    CTLineBreakMode lineBreak = [self.class lineBreakModeFromUILineBreakMode:self.lineBreakMode];
+    [self.mutableAttributedString setTextAlignment:alignment lineBreakMode:lineBreak lineHeight:self.lineHeight];
   }
 }