fix: make fontsize same for experiment label and secondary label for ATLAS (#531)

* Make fontsize same for experiment label and secondary label for ATLAS

* adjusted further to match the heights

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* updated reference image for pytest

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: diptaparna

.gitignore

@@ -49,6 +49,8 @@ coverage.xml
 *.cover
 .hypothesis/
 .pytest_cache/
+flow_th1.root
+result_images/
 
 # Translations
 *.mo

src/mplhep/label.py

@@ -183,7 +183,7 @@ def dist(tup):
         transform=_t,
         ha="left",
         va=loc2_dict[loc]["va"],
-        fontsize=_font_size,
+        fontsize=_font_size * 1.2 if exp == "ATLAS" else _font_size,
         fontname=fontname,
         fontstyle="italic" if italic[1] else "normal",
     )
@@ -329,7 +329,7 @@ def exp_label(
         fontname : string, optional
             Name of font to be used.
         fontsize : string, optional
-            Defines size of "secondary label". Experiment label is 1.3x larger.
+            Defines size of the experiment label and the secondary label.
         exp_weight : string, optional
             Set fontweight of <exp> label. Default "bold".
         italic : (bool, bool, bool), optional