Fix layout font settings of newly added file

Fix layout font settings of newly added file

Change "TextFont" to "Font". This fixes the following terminal
errors when opening the file:

  LyX: Unknown InsetLayout tag [around line 247 of file
  [layouts/jlreq-common.inc] current token: 'TextFont' context: '']
  LyX: Unknown InsetLayout tag [around line 247 of file
  [layouts/jlreq-common.inc] current token: 'Family' context: '']
  LyX: Unknown InsetLayout tag [around line 248 of file
  [layouts/jlreq-common.inc] current token: 'Typewriter' context: '']
  LyX: Unknown InsetLayout tag [around line 249 of file
  [layouts/jlreq-common.inc] current token: 'EndFont' context: '']