Fix required ditto version checking

[jmackie]

I tried adding a required ditto version to https://github.com/ditto-lang/std

diff --git a/ditto.toml b/ditto.toml
index 835b5b2..691be46 100644
--- a/ditto.toml
+++ b/ditto.toml
@@ -1,5 +1,6 @@
 name = "std"
 targets = ["web", "nodejs"]
+ditto-version = ">=0.0.2"

But that complained with:

  × error generating build.ninja
  ╰─▶ ditto version requirement not met for current_package: current version = 0.0.2-1-g2ea38ab, wanted = >=0.0.2

Maybe there's a way to specify in the requirement that pre should be ignored, but I also think ditto-version = ">=0.0.2" should just work. This PR makes it so.

(I also took the underscore out of current_package while I was there)

[codecov]

Codecov Report

Merging #134 (306f878) into main (2ea38ab) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #134   +/-   ##
=======================================
  Coverage   84.09%   84.10%           
=======================================
  Files          83       83           
  Lines       15377    15382    +5     
=======================================
+ Hits        12932    12937    +5     
  Misses       2445     2445           

Impacted Files	Coverage Δ
crates/ditto-make/src/build_ninja.rs	95.01% <100.00%> (+0.05%)	⬆️

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