Remove Java version evaluation

[shred]

According to JEP223, Java versions do not include trailing zero
elements. This means that e.g. Java 14.0.0 reports its version just as
"14". The changed code part expected at least three characters, so it
failed to start on such "zero-zero" Java releases. The evaluated java
version was not used anywhere, so the code block was removed.

For example, my machine is running Java 14 (openjdk version "14" 2020-03-17). When I start the IDE, the following exception is reported and the IDE won't start:

java.lang.ExceptionInInitializerError
	at processing.app.helpers.PreferencesMap.load(PreferencesMap.java:100)
	at processing.app.helpers.PreferencesMap.load(PreferencesMap.java:74)
	at processing.app.PreferencesData.init(PreferencesData.java:53)
	at processing.app.BaseNoGui.initParameters(BaseNoGui.java:856)
	at processing.app.Base.<init>(Base.java:197)
	at processing.app.Base.main(Base.java:135)
Caused by: java.lang.StringIndexOutOfBoundsException: begin 0, end 3, length 2
	at java.base/java.lang.String.checkBoundsBeginEnd(String.java:3756)
	at java.base/java.lang.String.substring(String.java:1902)
	at processing.app.legacy.PApplet.<clinit>(PApplet.java:38)
	... 6 more

This patch fixes the problem.

[cmaglie]

Thanks!