Correct cyrillic 'f' in newstroke

The lowercase greek phi had been used which did not match the cyrillic
f.  We use the variant of phi that includes the full strokes instead.

Fixes #3898 | https://gitlab.com/kicad/code/kicad/issues/3898

common/newstroke_font.cpp

@@ -1220,7 +1220,7 @@ const char* const newstroke_font[] =
     "HZVZT[P[NZMYLWLQMONNPMTMVN",
     "KYMMWM RRMR[",
     "JZMMR[ RWMR[P`OaMb",
-    "G]MMLNKPKVLXNZP[T[VZXXYVYPXNVMUMSNRPRb",
+    "G]RFRb RPMTMVNXPYRYVXXVZT[P[NZLXKVKRLPNNPM",
     "IZL[WM RLMW[",
     "I\\WMW[ RNMN[Y[Y`",
     "J\\VMV[ RNMNROTQUVU",

helpers/tools_to_build_newstroke-font/charlist.txt

@@ -881,7 +881,7 @@ skipcodes 5 0
 + C_SMALL
 + T_SMALLCAP
 + Y_SMALL
-+ PHI_SMALL
++ PHI_SMALL_VAR
 + X_SMALL
 + TSY_SMALL
 + CHERV_SMALL