fix(style): remove global styles that interfere with structure plots (FXC-1802)

Author: frederikschubertflex

tidy3d/style.mplstyle

@@ -1,4 +1 @@
 axes.prop_cycle : cycler(color=["#176737", "#FF7B0D", "#979BAA", "#F44E6A", "#0062FF", "#26AB5B", "#6D3EF2", "#F59E0B"])
-axes.grid       : True
-grid.linestyle  : :
-axes.edgecolor  : "#ECEBEA"