meson: adjust nlohmann-json dependency

Simplify meson dependency logic and align wrap file name choice with
other repositories.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I5388303c3a5227cfd3981878354cc62b90ebcb99
diff --git a/subprojects/nlohmann-json.wrap b/subprojects/nlohmann_json.wrap
similarity index 99%
rename from subprojects/nlohmann-json.wrap
rename to subprojects/nlohmann_json.wrap
index dbe7d46..3745380 100644
--- a/subprojects/nlohmann-json.wrap
+++ b/subprojects/nlohmann_json.wrap
@@ -1,6 +1,6 @@
 [wrap-git]
-url = https://github.com/nlohmann/json.git
 revision = HEAD
+url = https://github.com/nlohmann/json.git
 
 [provide]
 nlohmann_json = nlohmann_json_dep