Fix broken line spacing in Paragraph (#1086)

The line_spacing kwarg was missing when creating Text mobjects; this adds it.

Author: sebpearce

manim/mobject/svg/text_mobject.py

@@ -442,7 +442,7 @@ def __init__(self, *text, line_spacing=-1, alignment=None, **config):
         VGroup.__init__(self, **config)
 
         lines_str = "\n".join(list(text))
-        self.lines_text = Text(lines_str, **config)
+        self.lines_text = Text(lines_str, line_spacing=line_spacing, **config)
         lines_str_list = lines_str.split("\n")
         self.chars = self.gen_chars(lines_str_list)