Annot: Fix first lines of Annotations sometimes being cut off

What we're calculating in those two places is the top left corner for
where to draw the character substracting the descent doesn't make any
sense.

Bug #1246

poppler/Annot.cc

@@ -3324,7 +3324,7 @@ void AnnotFreeText::generateFreeTextAppearance()
 
     // Set font state
     appearBuilder.setDrawColor(da.getFontColor(), true);
-    appearBuilder.appendf("BT 1 0 0 1 {0:.2f} {1:.2f} Tm\n", textmargin, height - textmargin - da.getFontPtSize() * font->getDescent());
+    appearBuilder.appendf("BT 1 0 0 1 {0:.2f} {1:.2f} Tm\n", textmargin, height - textmargin);
     const DrawMultiLineTextResult textCommands = drawMultiLineText(*contents, textwidth, form, *font, da.getFontName().getName(), da.getFontPtSize(), quadding, 0 /*borderWidth*/);
     appearBuilder.append(textCommands.text.c_str());
     appearBuilder.append("ET Q\n");
@@ -5307,7 +5307,7 @@ void AnnotAppearanceBuilder::drawSignatureFieldText(const GooString &text, const
     const DrawMultiLineTextResult textCommands =
             drawMultiLineText(text, textwidth, form, *font, da.getFontName().getName(), da.getFontPtSize(), centerHorizontally ? VariableTextQuadding::centered : VariableTextQuadding::leftJustified, 0 /*borderWidth*/);
 
-    double yDelta = height - textmargin - da.getFontPtSize() * font->getDescent();
+    double yDelta = height - textmargin;
     if (centerVertically) {
         const double outTextHeight = textCommands.nLines * da.getFontPtSize();
         if (outTextHeight < height) {