modules.conf: Fix more differing usages of assignment operators.

I missed the changes in 18 and master in the previous review.

ASTERISK-24434 #close

Change-Id: Ieb132b2a998ce96daa9c9acf26535a974b895876

configs/samples/modules.conf.sample

@@ -46,11 +46,11 @@ noload = res_hep_pjsip.so
 noload = res_hep_rtcp.so
 ;
 ; Do not load chan_sip by default, it may conflict with res_pjsip.
-noload => chan_sip.so
+noload = chan_sip.so
 ;
 ; Load one of the voicemail modules as they are mutually exclusive.
 ; By default, load app_voicemail only (automatically).
 ;
-;noload => app_voicemail.so
-noload => app_voicemail_imap.so
-noload => app_voicemail_odbc.so
+;noload = app_voicemail.so
+noload = app_voicemail_imap.so
+noload = app_voicemail_odbc.so