[Core] Add space between scenario url and name

[mpkorstanje]

The summary printer concatenated the url and scenario name without an
additional space. This made it impossible to click the urls.

Fixes: #2184

[codecov]

Codecov Report

Merging #2185 (81ef38e) into main (0eee709) will increase coverage by 0.01%.
The diff coverage is 91.66%.

@@             Coverage Diff              @@
##               main    #2185      +/-   ##
============================================
+ Coverage     82.80%   82.82%   +0.01%     
+ Complexity     2328     2327       -1     
============================================
  Files           306      306              
  Lines          8300     8296       -4     
  Branches        763      762       -1     
============================================
- Hits           6873     6871       -2     
+ Misses         1118     1116       -2     
  Partials        309      309              

Impacted Files	Coverage Δ	Complexity Δ
...e/src/main/java/io/cucumber/core/plugin/Stats.java	90.00% <91.66%> (+1.19%)	36.00 <0.00> (-1.00)	⬆️

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