Fix for the MS error

[18:43:07] [Server thread/ERROR]: Error occurred while enabling MagicSpells v4.0-Beta-2 (Is it up to date?)
java.lang.IllegalArgumentException: Dummy is not a defined variable!

Rewrite (Requires MS 4.0+, doesn't require EffectLib)

For Minecraft 1.13.2. Requires MagicSpells versions 4.0 and above. EffectLib is not required because it comes with MagicSpells.

Changes:

• Back button takes you back to the previous page instead of the home page.
• In preview whole numbers are not displayed as decimal numbers but as whole (Only for pitch).
• If either pitch or volume are at their default value, it won't display them at all. (Meaning 1.0 for both)

Here's an example of pitch: 2.0 and volume: 1.0

Initial Release (requires MS below 4.0 and EffectLib)

For Minecraft 1.8.x-1.12.2. Requires MagicSpells versions below 4.0 (suggested 3.5) which require EffectLib to run.